Schedule II Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance, Beginning	$ 14,120	$ 12,317	$ 11,536
Valuation Allowances and Reserves, Charged to Cost and Expense	1,775	2,106	1,933
Valuation Allowances and Reserves, Charged to Other Accounts	115	267	(220)
Valuation Allowances and Reserves, Deductions	1,154	570	932
Valuation Allowances and Reserves, Balance, Ending	14,856	14,120	12,317
Valuation Allowance of Deferred Tax Assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance, Beginning	23,177	34,738	44,669
Valuation Allowances and Reserves, Charged to Cost and Expense	0	0	0
Valuation Allowances and Reserves, Charged to Other Accounts	10,131	4,764	912
Valuation Allowances and Reserves, Deductions	1,611	16,325	10,843
Valuation Allowances and Reserves, Balance, Ending	$ 31,697	$ 23,177	$ 34,738