Schedule II - Valuation And Qualifying Accounts and Reserves (Details) - Allowance For Doubtful Accounts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning Balance	$ 6,136	$ 3,919	$ 3,970
Additions Charged to Costs and Expenses	4,335	4,470	1,990
Additions Charged to Other Accounts	0	0	0
Deductions	5,863	2,253	2,041
Ending Balance	$ 4,608	$ 6,136	$ 3,919