Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts receivable
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 30,544	$ 27,261	$ 24,852
Charged to Expenses	12,005	9,825	7,467
Deductions	(5,353)	(3,670)	(4,313)
Translation Adjustments	(2,109)	(2,872)	(745)
Balance at End of Period	35,087	30,544	27,261
Deferred tax valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	29,561	37,044	39,310
Charged to Expenses	6,283	1,742	7,053
Deductions	(8,068)	(6,056)	(8,135)
Translation Adjustments	(1,447)	(3,169)	(1,184)
Balance at End of Period	$ 26,329	$ 29,561	$ 37,044