Accounts Receivable, Net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010 As Restated [Member]		Dec. 31, 2009 As Restated [Member]		Dec. 31, 2011 Trade Accounts Receivable [Member]	Dec. 31, 2010 Trade Accounts Receivable [Member] As Restated [Member]
Accounts Receivable, Net, Current [Abstract]
Trade receivables						$ 120,349	$ 115,282
Allowance for doubtful accounts	(5,571)	(4,240)		(6,778)		(5,571)	(4,240)
Total	114,778	111,042	[1]			114,778	111,042
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	4,240	6,778		5,139		5,571	4,240
Provision for doubtful accounts	0	1,000	[1]	1,900	[1]
Deductions, net	1,331	(3,538)		(261)
Balance at end of period	$ 5,571	$ 4,240		$ 6,778		$ 5,571	$ 4,240

[1] As restated - See Note 23 “Restatement of Previously Issued Financial Statements” of Notes to Consolidated Financial Statements.