Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Additions Charged to Cost and Expenses		$ 11,600	$ (1,600)	$ 1,800
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	[1]	25,469	24,073	21,491
Additions Charged to Cost and Expenses	[1]	19,624	17,817	17,412
Additions Charged to Other Accounts— Acquisitions and Related Adjustments	[1]	152	(443)	79
Deductions From Reserve	[1]	(1,309)	(15,978)	(14,909)
Balance at End of Year	[1]	43,936	25,469	24,073
Deferred tax asset valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	[2]	15,378	18,058	17,975
Additions Charged to Cost and Expenses	[2]	18,548	1,366	2,352
Additions Charged to Other Accounts— Acquisitions and Related Adjustments	[2]	(3,596)	(996)	0
Deductions From Reserve	[2]	(5,605)	(3,050)	(2,269)
Balance at End of Year	[2]	$ 24,725	$ 15,378	$ 18,058

[1] Deductions from reserve represent accounts written off and recoveries.

[2] Deductions from reserve result from the expiration or utilization of net operating losses and foreign tax credits previously reserved.