Correction of Errors in Previously Reported Financial Statements, (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Condensed consolidated statements of cash flows
Net cash provided by (used in) operating activities	$ 39,268	[1]	$ 48,270	[1]	$ 122,367	[1]
Net cash (used in) investing activities	(54,172)	[1]	(48,739)	[1]	(44,032)	[1]
Net cash provided by (used in) financing activities	11,339	[1]	(778)	[1]	(71,260)	[1]
Effect of foreign currency rate changes on cash	873	[1]	386	[1]	1,153	[1]
Net increase (decrease) in cash and cash equivalents	(2,692)	[1]	(861)	[1]	8,228	[1]
Cash and cash equivalents at the beginning of the year	26,808	[1]	27,669	[1]	19,441	[1]
Cash and cash equivalents at end of the year	24,116	[1]	26,808	[1]	27,669	[1]
Previously reported [Member]
Condensed consolidated statements of cash flows
Net cash provided by (used in) operating activities	38,600		48,100
Net cash (used in) investing activities	(54,700)		(48,100)
Net cash provided by (used in) financing activities	11,600		(800)
Effect of foreign currency rate changes on cash	900		400
Net increase (decrease) in cash and cash equivalents	(3,600)		(400)
Cash and cash equivalents at the beginning of the year	27,300		27,700
Cash and cash equivalents at end of the year	23,700		27,300
Adjustments [Member]
Condensed consolidated statements of cash flows
Net cash provided by (used in) operating activities	700		100
Net cash (used in) investing activities	500		(600)
Net cash provided by (used in) financing activities	(300)		0
Effect of foreign currency rate changes on cash	0		0
Net increase (decrease) in cash and cash equivalents	900		(500)
Cash and cash equivalents at the beginning of the year	(500)		0
Cash and cash equivalents at end of the year	$ 400		$ (500)

[1] Restated