Schedule II Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance, Beginning	$ 12,317	$ 11,536	$ 12,399
Valuation Allowances and Reserves, Charged to Cost and Expense	2,106	1,933	436
Valuation Allowances and Reserves, Charged to Other Accounts	267	(220)	(61)
Valuation Allowances and Reserves, Deductions	570	932	1,238
Valuation Allowances and Reserves, Balance, Ending	14,120	12,317	11,536
Valuation Allowance of Deferred Tax Assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance, Beginning	34,738	44,669	59,586
Valuation Allowances and Reserves, Charged to Cost and Expense	0	0	0
Valuation Allowances and Reserves, Charged to Other Accounts	4,764	912	5,342
Valuation Allowances and Reserves, Deductions	16,325	10,843	20,259
Valuation Allowances and Reserves, Balance, Ending	$ 23,177	$ 34,738	$ 44,669