Accrued Liabilities (Tables)

6 Months Ended

Jun. 30, 2013

Payables And Accruals [Abstract]

Components of Accrued Liabilities

Accrued liabilities consisted of the following:

	As of
	June 30,		December 31,
	2013		2012
Personnel expense	$	15,727	$	20,872
Workers’ compensation		15,281		15,754
Deferred revenue		11,952		—
Professional fees		870		2,145
Insurance		2,150		2,253
Utilities		1,607		1,844
Taxes		1,097		1,745
Tooling		712		686
Other		3,289		3,125
Total accrued liabilities	$	52,685	$	48,424