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Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Interest and Debt Expense [Abstract]          
Interest incurred on debt $ 5,282 $ 5,345 $ 10,452 $ 10,714  
Amortization of discount on Senior Subordinated Notes 3,261 3,048 6,468 6,045  
Amortization of debt issuance costs 652 762 1,196 1,395  
Total interest expense $ 9,195 $ 9,155 $ 18,116 $ 18,154  
Effective interest rate, revolving credit facility     2.37% 2.17%  
Senior Subordinated Notes implied rate     7.00%    
Stated interest rate         6.375%