Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Senior debt:
Total debt	$ 157,250	$ 161,500
Less: Current maturities	(17,000)	(17,000)
Total long-term debt, net of current maturities	140,250	144,500
Term loans [Member]
Senior debt:
Total debt	$ 157,250	$ 161,500