Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Amortization period for intangible assets	13 years 1 month 6 days	13 years
Period of purchase from suppliers as basis for volume discounts	1 year
Fair value of financial instruments [Abstract]
Fair value of fixed-rate notes payable	$ 26,707	$ 30,392
Carrying value of fixed-rate notes payable	26,229	29,301
Other long-term liabilities [Abstract]
Multiemployer pension withdrawal liability	32,516
Changes in fair value of contingent consideration [Roll Forward]
Liability balance, beginning of period	31,683
Accretion of present value discount	833
Liability balance, end of period	32,516	31,683
Level 1 [Member]
Other long-term liabilities [Abstract]
Multiemployer pension withdrawal liability	0
Level 2 [Member]
Other long-term liabilities [Abstract]
Multiemployer pension withdrawal liability	0
Level 3 [Member]
Other long-term liabilities [Abstract]
Multiemployer pension withdrawal liability	$ 32,516
Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Finite-Lived Intangible Assets [Line Items]
Amortization period for intangible assets	3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	30 years
Finite-Lived Intangible Assets [Line Items]
Amortization period for intangible assets	7 years