Consolidated Statement of Changes in Shareholders' Equity and Comprehensive Loss (USD $) In Thousands, unless otherwise specified	Total USD ($)	Common Stock	Common Stock Including Additional Paid in Capital [Member] USD ($)	Accumulated Deficit USD ($)	Accumulated Other Comprehensive Income USD ($)	Total Comprehensive Loss (1) USD ($)
Balances at Dec. 31, 2008	$ 157,468		$ 245,748	$ (91,747)	$ 3,467
Balance, Shares at Dec. 31, 2008		23,033
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued pursuant to benefit plans, shares		761
Shares issued pursuant to benefit plans, value	4,754		4,754
Stock-based compensation associated with employee benefit plans	8,520		8,520
Vesting of restricted stock units, shares		135
Restricted share forfeitures for tax settlements, value	(352)		(352)
Restricted share forfeitures for tax settlements, shares		(53)
Shares issued for acquisitions, Value	0
Net adjustment for fair value of hedge derivatives	1,606				1,606	1,606
Translation adjustments	288				288	288
Net loss for the period	(42,567)			(42,567)		(42,567)
Balances at Dec. 31, 2009	129,717		258,670	(134,314)	5,361	(40,673)
Balance, Shares at Dec. 31, 2009		23,876
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued pursuant to benefit plans, shares		380
Shares issued pursuant to benefit plans, value	2,586		2,586
Stock-based compensation associated with employee benefit plans	6,158		6,158
Vesting of restricted stock units, shares		144
Restricted share forfeitures for tax settlements, value	(469)		(469)
Restricted share forfeitures for tax settlements, shares		(49)
Shares issued for acquisitions, Value	0
Net adjustment for fair value of hedge derivatives	(354)				(354)	(354)
Translation adjustments	125				125	125
Net loss for the period	(369)			(369)		(369)
Balances at Dec. 31, 2010	137,394		266,945	(134,683)	5,132	(598)
Balance, Shares at Dec. 31, 2010		24,351
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued pursuant to benefit plans, shares		335
Shares issued pursuant to benefit plans, value	1,960		1,960
Stock-based compensation associated with employee benefit plans	5,717		5,717
Vesting of restricted stock units, shares		161
Restricted share forfeitures for tax settlements, value	(295)		(295)
Restricted share forfeitures for tax settlements, shares		(45)
Repurchases of common stock, shares		(518)
Repurchases of common stock, value	(3,920)		(3,920)
Shares issued for acquisitions, Shares		3,665
Shares issued for acquisitions, Value	30,818		30,818
Net adjustment for fair value of hedge derivatives	(1,167)				(1,167)	(1,167)
Gain on liquidiation of foreign subsidiary	(2,081)				(2,081)	(2,081)
Translation adjustments	(164)				(164)	(164)
Net loss for the period	(4,225)			(4,225)		(4,225)
Balances at Dec. 31, 2011	$ 164,037		$ 301,225	$ (138,908)	$ 1,720	$ (7,637)
Balance, Shares at Dec. 31, 2011		27,949