Quarterly report pursuant to Section 13 or 15(d)

Borrowings (Term Loans) (Narrative) (Details)

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Borrowings (Term Loans) (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
Oct. 08, 2014
Jun. 30, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]      
Debt instrument outstanding   $ 340,000 $ 340,000
Secured Second Lien Term Loan [Member]      
Line of Credit Facility [Line Items]      
Debt instrument outstanding   $ 300,000 $ 300,000
Debt instrument, description   The prepayment amount (i) is 102% if the prepayment event occurs prior to October 8, 2016, (ii) 101% if the prepayment event occurs on or after October 8, 2016 but before October 8, 2017, and (iii) is 100% for prepayments made on or after October 8, 2017. The Term Loan is secured by junior liens on properties mortgaged under the Credit Facility, subject to an intercreditor agreement.  
Proceeds from issuance of debt $ 300,000    
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%