Schedule II - Schedule of Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance January 1,	$ 7,815	$ 9,078	$ 11,711
Charged to Expenses (Benefit)	47,187	44,961	39,016
Write-offs/ Payments/ Other	(48,884)	(46,224)	(41,649)
Balance December 31,	6,118	7,815	9,078
Deferred tax assets—valuation allowance [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance January 1,	4,995	7,831	9,835
Charged to Expenses (Benefit)	44,100	(2,836)	(4,228)
Write-offs/ Payments/ Other	0	0	2,224
Balance December 31,	49,095	4,995	7,831
Allowance for obsolescence [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance January 1,	10,724	14,218	16,159
Charged to Expenses (Benefit)	(34)	(335)	(773)
Write-offs/ Payments/ Other	(741)	(3,159)	(1,168)
Balance December 31,	$ 9,949	$ 10,724	$ 14,218