Fair Value Measurement (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value Measurement
Long-term debt	$ (288,666)	$ (310,559)
Senior credit facility, net of discount
Fair Value Measurement
Long-term debt	(286,672)	(307,939)
Other obligations
Fair Value Measurement
Long-term debt	(1,994)	(2,620)
Carrying Amount
Fair Value Measurement
Cash and cash equivalents	23,158	28,450
Carrying Amount | Senior credit facility, net of discount
Fair Value Measurement
Long-term debt	(286,672)	(307,939)
Carrying Amount | Other obligations
Fair Value Measurement
Long-term debt	(1,994)	(2,620)
Fair Value
Fair Value Measurement
Cash and cash equivalents	23,158	28,450
Fair Value | Senior credit facility, net of discount
Fair Value Measurement
Long-term debt	(286,672)	(307,939)
Fair Value | Other obligations
Fair Value Measurement
Long-term debt	$ (1,994)	$ (2,620)