Condensed Consolidated Statement of Comprehensive Income (Loss) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				12 Months Ended
	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		$ 166,733		$ 137,394	$ 166,733	$ 137,394	$ 129,717
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures					319,000
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures					1,272	1,960	2,586
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition					1,391	5,717	6,158
Payments Related to Tax Withholding for Share-based Compensation					(164)	(295)	(469)
Restricted Stock, Value, Shares Issued Net of Tax Withholdings					0	0	0
Stock Repurchased During Period, Value						(3,920)
Issuance of common stock for acquisitions					0	30,818	0
Net income (loss)	(4,855)	(4,815)	(6,651)	(529)	(43,474)	(1,529)	(369)
Translation adjustments					(325)	(164)	125
Net adjustment for fair value of hedge derivatives (A)					9	(1,167)	(354)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax						(2,081)	0
Comprehensive income (loss)					(43,790)	(4,941)	(598)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	125,442		166,733		125,442	166,733	137,394
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent					(316)	(3,412)	(229)
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Issued		27,949,000		24,351,000	27,949,000	24,351,000	23,876,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		301,225		266,945	301,225	266,945	258,670
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures					384,000	335,000	380,000
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures					1,272	1,960	2,586
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition					1,391	5,717	6,158
Stock Issued During Period, Shares, Restricted Stock Award, Gross					176,000	161,000	144,000
Payments Related to Tax Withholding for Share-based Compensation					(164)	(295)	(469)
Restricted Stock, Value, Shares Issued Net of Tax Withholdings					0	0	0
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited					(38,000)	(45,000)	(49,000)
Stock Repurchased During Period, Shares						(518,000)
Stock Repurchased During Period, Value						(3,920)
Stock Issued During Period, Shares, Acquisitions						3,665,000
Issuance of common stock for acquisitions						30,818
Net income (loss)					0	0	0
Translation adjustments					0	0	0
Net adjustment for fair value of hedge derivatives (A)					0	0	0
Shares, Issued	0		0		0	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax						0
Common Stock, Shares, Issued	28,471,000		27,949,000		28,471,000	27,949,000	24,351,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	303,724		301,225		303,724	301,225	266,945
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		(136,212)		(134,683)	(136,212)	(134,683)	(134,314)
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures					0	0	0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition					0	0	0
Payments Related to Tax Withholding for Share-based Compensation					0	0	0
Restricted Stock, Value, Shares Issued Net of Tax Withholdings					0	0	0
Stock Repurchased During Period, Value						0
Issuance of common stock for acquisitions						0
Net income (loss)						(1,529)	(369)
Translation adjustments					0	0	0
Net adjustment for fair value of hedge derivatives (A)					0	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax						0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(179,686)		(136,212)		(179,686)	(136,212)	(134,683)
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		1,720		5,132	1,720	5,132	5,361
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures					0	0	0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition					0	0	0
Payments Related to Tax Withholding for Share-based Compensation					0	0	0
Restricted Stock, Value, Shares Issued Net of Tax Withholdings					0	0	0
Stock Repurchased During Period, Value						0
Issuance of common stock for acquisitions						0
Net income (loss)					0	0	0
Translation adjustments					(325)	(164)	125
Net adjustment for fair value of hedge derivatives (A)					9	(1,167)	(354)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax						(2,081)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,404		$ 1,720		$ 1,404	$ 1,720	$ 5,132