Quarterly report pursuant to Section 13 or 15(d)

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

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Borrowings (Term Loans and Senior Notes) (Narrative) (Details) - USD ($)
9 Months Ended
Oct. 11, 2016
Oct. 03, 2016
Oct. 08, 2014
Sep. 30, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]          
Debt instrument outstanding       $ 300,000,000 $ 340,000,000
Unamortized deferred financing costs       9,915,000 11,435,000
Secured Second Lien Term Loan [Member]          
Line of Credit Facility [Line Items]          
Debt instrument outstanding       $ 300,000,000 $ 300,000,000
Debt instrument, description       The prepayment amount would be (i) 102% of principal if the prepayment event occurred prior to October 8, 2016, (ii) 101% of principal if the prepayment event occurred on or after October 8, 2016, but before October 8, 2017, and (iii) 100% of principal for prepayments made on or after October 8, 2017. The Term Loan was secured by junior liens on properties mortgaged under the Credit Facility, subject to an intercreditor agreement.  
Proceeds from issuance of debt     $ 300,000,000    
Debt instrument, interest rate, effective       8.50%  
Floor rate       1.00%  
Debt instrument interest rate       7.50%  
Debt instrument maturity date       Oct. 08, 2021  
Secured Second Lien Term Loan [Member] | Prior to First Anniversary [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Prepayment Premium Percentage     102.00%    
Secured Second Lien Term Loan [Member] | After First Anniversary but Prior to Second Anniversary [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Prepayment Premium Percentage     101.00%    
Secured Second Lien Term Loan [Member] | After Second Anniversary [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Prepayment Premium Percentage     100.00%    
6.125% Senior Unsecured Notes Due 2024 [Member]          
Line of Credit Facility [Line Items]          
Debt instrument maturity date       Oct. 01, 2024  
Subsequent Event [Member] | 6.125% Senior Unsecured Notes Due 2024 [Member]          
Line of Credit Facility [Line Items]          
Debt instrument aggregate principal amount   $ 400,000,000      
Debt instrument, interest rate, stated (as a percent)   6.125%      
Loss on early extinguishment of debt $ 12,851,000        
Net proceeds from issuance of senior unsecured notes   $ 391,270,000      
Debt instrument, prepayment fees 3,000,000        
Percentage of aggregate principal amount in which issuance price is applied   100.00%      
Unamortized deferred financing costs $ 9,851,000