Fair Value Measurement (Details 4) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value Measurement
Long-term debt	$ (304,271)	$ (288,666)
Book overdrafts	26,748	29,310
Senior credit facility, net of discount
Fair Value Measurement
Long-term debt	(302,320)	(286,672)
Other obligations
Fair Value Measurement
Long-term debt	(1,951)	(1,994)
Carrying Amount
Fair Value Measurement
Cash and cash equivalents	24,271	23,158
Carrying Amount | Senior credit facility, net of discount
Fair Value Measurement
Long-term debt	(302,320)	(286,672)
Carrying Amount | Other obligations
Fair Value Measurement
Long-term debt	(1,951)	(1,994)
Fair Value
Fair Value Measurement
Cash and cash equivalents	24,271	23,158
Fair Value | Senior credit facility, net of discount
Fair Value Measurement
Long-term debt	(302,320)	(286,672)
Fair Value | Other obligations
Fair Value Measurement
Long-term debt	$ (1,951)	$ (1,994)