Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value
Transfers between levels	$ 0	$ 0
Carrying Amount | Level 2 | Notes
Fair Value
Long-term debt and interest payable		279,763
Fair Value | Level 3
Fair Value
Long-term debt and interest payable	326,100	116,000
Fair Value | Level 2 | Notes
Fair Value
Long-term debt and interest payable		309,256
2011 Term Loan and interest payable | Carrying Amount | Level 3 | Senior secured term loan facility
Fair Value
Long-term debt and interest payable		115,367
2011 Term Loan and interest payable | Fair Value | Level 3 | Senior secured term loan facility
Fair Value
Long-term debt and interest payable		$ 115,975
2015 Term Loan and interest payable | Carrying Amount | Level 3 | Senior secured term loan facility
Fair Value
Long-term debt and interest payable	323,210
2015 Term Loan and interest payable | Fair Value | Level 3 | Senior secured term loan facility
Fair Value
Long-term debt and interest payable	326,102
Interest Rate Swap | Carrying Amount | Level 2 | Senior secured term loan facility
Fair Value
Long-term debt and interest payable	3,337
Interest Rate Swap | Fair Value | Level 2 | Senior secured term loan facility
Fair Value
Long-term debt and interest payable	$ 3,337