Annual report pursuant to Section 13 and 15(d)

Borrowings (Term Loans and Senior Notes) (Narrative) (Details)

v3.6.0.2
Borrowings (Term Loans and Senior Notes) (Narrative) (Details) - USD ($)
12 Months Ended
Oct. 11, 2016
Oct. 08, 2014
Dec. 31, 2016
Dec. 31, 2014
Dec. 31, 2015
Mar. 11, 2014
Line of Credit Facility [Line Items]            
Debt instrument outstanding     $ 400,000,000   $ 340,000,000  
Gain (loss) on early extinguishment of debt     $ (12,883,000) $ 151,000    
Secured Second Lien Term Loan [Member]            
Line of Credit Facility [Line Items]            
Debt instrument outstanding         300,000,000  
Debt, initial commitment           $ 100,000,000
Debt, additional availability           25,000,000
Debt instrument maturity date     Sep. 11, 2019      
Gain (loss) on early extinguishment of debt   $ (3,054,000)        
Unamortized deferred financing costs         $ 11,435,000  
Secured Second Lien Term Loan [Member] | Maximum [Member]            
Line of Credit Facility [Line Items]            
Debt instrument aggregate principal amount           $ 125,000,000
Secured Second Lien Term Loan [Member] | Prior to March 11, 2015 [Member]            
Line of Credit Facility [Line Items]            
Debt instrument redemption price percent     102.00%      
Secured Second Lien Term Loan [Member] | On or After March 15, 2015 But Before March 15, 2016 [Member]            
Line of Credit Facility [Line Items]            
Debt instrument redemption price percent     101.00%      
Secured Second Lien Term Loan [Member] | On or After March 15, 2016 [Member]            
Line of Credit Facility [Line Items]            
Debt instrument redemption price percent     100.00%      
Secured Second Lien Term Loan [Member] | Prior to October 8, 2016 [Member]            
Line of Credit Facility [Line Items]            
Debt instrument redemption price percent   102.00%        
Secured Second Lien Term Loan [Member] | On or After October 8, 2016 But Before October 8, 2017 [Member]            
Line of Credit Facility [Line Items]            
Debt instrument redemption price percent   101.00%        
Secured Second Lien Term Loan [Member] | On or After October 8, 2017 [Member]            
Line of Credit Facility [Line Items]            
Debt instrument redemption price percent   100.00%        
New Secured Second Lien Term Loan Facility [Member]            
Line of Credit Facility [Line Items]            
Debt instrument, description     The Company elected a LIBOR rate based on various tenors, and was incurring interest based on an underlying three-month LIBOR rate, which was last elected in July 2016.      
Debt instrument maturity date     Oct. 08, 2021      
Debt instrument interest rate   7.50%        
Gain (loss) on early extinguishment of debt $ (12,883,000)          
Debt instrument, prepayment fees 3,000,000          
Unamortized deferred financing costs $ 9,883,000          
New Secured Second Lien Term Loan Facility [Member] | Interest Rate Floor [Member]            
Line of Credit Facility [Line Items]            
Debt instrument interest rate   1.00%