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 receivable
Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 11,997	$ 6,413	$ 844
Additions Charged to Costs and Expenses	5,005	5,679	5,851
Deductions, Write-offs	(5,102)	(95)	(282)
Balance at End of Period	11,900	11,997	6,413
Allowance for deferred tax assets
Valuation and Qualifying Accounts
Balance at Beginning of Period	3,659	5,323	7,861
Additions Charged to Costs and Expenses	899	193	478
Deductions, Write-offs	(80)	(463)	(91)
Deductions, Reclassifications		(1,394)	(2,925)
Balance at End of Period	$ 4,478	$ 3,659	$ 5,323