Organization and Description of Business Revisions to Prior Period Financial Statements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues	$ 80,801	$ 88,529
Cost of revenues (exclusive of depreciation and amortization)	38,177	42,764
Selling, general and administrative	31,200	31,525
Depreciation and amortization	8,352	9,286
Restatement Adjustment [Member]
Revenues		19
Cost of revenues (exclusive of depreciation and amortization)		288
Selling, general and administrative		88
Depreciation and amortization		$ 16