Restatement of Consolidated Financial Statements (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Balance Sheet Data [Abstract]
Deferred tax asset, current	$ 19,441	$ 10,860
Deferred tax asset, long term	20,186	25,437
Goodwill	24,500	24,005
Cash Flow Data [Abstract]
Operating activities-Deferred income taxes	(2,330)	(5,751)	2,018
Operating activities-Other accrued liabilities	5,719	3,036	6,291
Scenario, Previously Reported [Member]
Balance Sheet Data [Abstract]
Deferred tax asset, current	18,633	10,079
Deferred tax asset, long term	18,457	22,977
Goodwill	27,852	27,246
Other current liabilities	22,914
Cash Flow Data [Abstract]
Operating activities-Deferred income taxes	(3,132)
Operating activities-Other accrued liabilities	6,521
Restatement Adjustment [Member]
Balance Sheet Data [Abstract]
Deferred tax asset, current	808	781
Deferred tax asset, long term	1,729	2,460
Goodwill	(3,352)	(3,241)
Other current liabilities	(815)
Cash Flow Data [Abstract]
Operating activities-Deferred income taxes	802
Operating activities-Other accrued liabilities	(802)
As Restated [Member]
Balance Sheet Data [Abstract]
Deferred tax asset, current	19,441	10,860
Deferred tax asset, long term	20,186	25,437
Goodwill	24,500	24,005
Other current liabilities	22,099
Cash Flow Data [Abstract]
Operating activities-Deferred income taxes	(2,330)
Operating activities-Other accrued liabilities	$ 5,719