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Debt (Summary of Long-Term Debt) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Debt [Line Items]          
Total Long-Term Debt, net $ 600,485 $ 606,480 $ 600,485 $ 606,480 $ 604,961
York Property Mortgage          
Debt [Line Items]          
Long-term debt 310,834 317,047 310,834 317,047 315,504
Unamortized discount 5,808 6,818 5,808 6,818 6,565
Senior Notes 2022          
Debt [Line Items]          
Long-term debt 296,197 295,646 296,197 295,646 295,749
Unamortized discount 3,803 4,354 3,803 4,354 4,251
York Property Mortgage          
Debt [Line Items]          
Less current portion (6,546) (6,213) (6,546) (6,213) (6,292)
Unamortized discount $ 1,010 $ 1,010 $ 1,010 $ 1,010 $ 1,010
SFS Credit Facility          
Debt [Line Items]          
Weighted-average cost of borrowing (as a percent) 3.40% 2.90% 3.30% 2.90% 2.90%