Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Senior debt:
Total debt	$ 443,581	$ 192,640
Less: Current maturities	(10,000)	(10,938)
Total long-term debt, net of current maturities	433,581	181,702
Revolving credit facility [Member]
Senior debt:
Total debt	246,081	22,015
Term loans [Member]
Senior debt:
Total debt	$ 197,500	$ 170,625