Annual report pursuant to Section 13 and 15(d)

Borrowings (Term Loans) (Narrative) (Details)

v3.10.0.1
Borrowings (Term Loans) (Narrative) (Details) - USD ($)
12 Months Ended
May 19, 2017
Oct. 11, 2016
Oct. 08, 2014
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 03, 2016
Line of Credit Facility [Line Items]              
Gain (loss) on early extinguishment of debt       $ 0 $ 0 $ (12,883,000)  
Unamortized deferred financing costs       $ 16,996,000 $ 12,398,000    
Secured Second Lien Term Loan | On or After March 15, 2015 But Before March 15, 2016              
Line of Credit Facility [Line Items]              
Debt instrument redemption price percent (as a percent)   101.00%          
New Secured Second Lien Term Loan Facility              
Line of Credit Facility [Line Items]              
Debt instrument maturity date     Oct. 08, 2021        
Gain (loss) on early extinguishment of debt   $ 12,883,000          
Debt instrument, prepayment fees   3,000,000          
Unamortized deferred financing costs   $ 9,883,000          
6.125% senior unsecured notes due 2024              
Line of Credit Facility [Line Items]              
Debt instrument aggregate principal amount $ 200,000,000           $ 400,000,000
Debt instrument redemption price percent (as a percent) 104.125%            
Debt instrument, interest rate, stated (as a percent) 6.125%     6.125%     6.125%