Schedule II Valuation and Qualifying Accounts - Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 14,850	$ 12,083	$ 12,522
Charged to (Reduction in) Costs and Expenses	3,987	5,045	3,197
Other	(2,155)	0	278
Deductions	(2,722)	(2,278)	(3,914)
Balance at End of Period	13,960	14,850	12,083
Valuation Allowance of Deferred Tax Assets
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	13,177	8,733	7,570
Charged to (Reduction in) Costs and Expenses	(2,209)	4,444	1,163
Other	0	0	0
Deductions	0	0	0
Balance at End of Period	$ 10,968	$ 13,177	$ 8,733