Debt (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013
Details of Debt
Carrying value	$ 595,421,000		$ 565,125,000
Less current portion	4,158,000		3,438,000
Long-term debt	591,263,000		561,687,000
Line of Credit Facility, Current Borrowing Capacity	110,000,000		110,000,000
Term Loan
Details of Debt
Carrying value	405,421,000		368,125,000
Senior Notes
Details of Debt
Carrying value	190,000,000		190,000,000
Revolving Facility ($110 million)
Details of Debt
Carrying value		[1]	7,000,000	[1]
Line of Credit Facility, Current Borrowing Capacity	$ 91,800,000		$ 84,700,000

[1] The Company had $91.8 million of borrowing capacity available under its revolving credit facility (“Revolving Facility”), net of $18.2 million of outstanding letters of credit at September 30, 2014. At December 31, 2013, the Company had $84.7 million of borrowing capacity available under its Revolving Facility, net of $18.3 million of outstanding letters of credit and borrowings of $7.0 million.