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Fair Value Measurement (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Summary of long term restricted marketable securities component and workers' compensation deposits
Cost	$ 4,403	$ 9,870
Municipal bonds [Member] \| Long-term Available-for-sale [Member]
Summary of long term restricted marketable securities component and workers' compensation deposits
Cost	2,723	292
Fair Value Category		2
Corporate bonds [Member] \| Long-term Available-for-sale [Member]
Summary of long term restricted marketable securities component and workers' compensation deposits
Cost	1,210	9,111
Fair Value Category		2
Available-for-sale Securities [Member]
Summary of long term restricted marketable securities component and workers' compensation deposits
Cost	9,828	8,735
Gross Unrealized Gains	15	22
Recorded Basis	9,843	8,757
Available-for-sale Securities [Member] \| Municipal bonds [Member] \| Long-term Available-for-sale [Member]
Summary of long term restricted marketable securities component and workers' compensation deposits
Cost	4,911	4,920
Gross Unrealized Gains	14	17
Recorded Basis	4,925	4,937
Fair Value Category		2
Available-for-sale Securities [Member] \| Corporate bonds [Member] \| Long-term Available-for-sale [Member]
Summary of long term restricted marketable securities component and workers' compensation deposits
Cost	2,445	2,035
Gross Unrealized Gains	1	5
Recorded Basis	2,446	2,040
Fair Value Category		2
Available-for-sale Securities [Member] \| U.S. treasuries [Member] \| Long-term Available-for-sale [Member]
Summary of long term restricted marketable securities component and workers' compensation deposits
Cost	2,472	1,780
Gross Unrealized Gains	0	0
Recorded Basis	2,472	1,780
Fair Value Category		$ 1