Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 70,315,000	$ 66,088,000	$ 77,089,000	$ 78,440,000
Additions based on tax positions related to the current year	7,929,000	17,131,000	11,765,000
Additions for tax positions of prior years	9,076,000	2,900,000	1,564,000
Reductions for tax positions of prior years	(3,067,000)	(17,135,000)	(6,047,000)
Settlements	(3,106,000)	(1,153,000)	(998,000)
Lapse of statutes	(6,605,000)	(12,744,000)	(7,635,000)
Unrecognized potential tax benefits that would impact effective tax rate	55,300,000
Potential interest and penalty expense (income)	700,000	(4,300,000)	(1,300,000)
Accrued interest and penalties	14,600,000	13,900,000
Continuing Operations [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits	59,593,000	55,366,000	66,367,000	65,226,000
Additions based on tax positions related to the current year	7,929,000	17,131,000	11,751,000
Additions for tax positions of prior years	9,076,000	2,900,000	1,065,000
Reductions for tax positions of prior years	(3,067,000)	(17,135,000)	(5,782,000)
Settlements	(3,106,000)	(1,153,000)	(843,000)
Lapse of statutes	(6,605,000)	(12,744,000)	(5,050,000)
Discontinued Operations [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits	10,722,000	10,722,000	10,722,000	$ 13,214,000
Additions based on tax positions related to the current year	0	0	14,000
Additions for tax positions of prior years	0	0	499,000
Reductions for tax positions of prior years	0	0	(265,000)
Settlements	0	0	(155,000)
Lapse of statutes	0	$ 0	$ (2,585,000)
Minimum [Member]
Income Tax Contingency [Line Items]
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, upper bound	0
Maximum [Member]
Income Tax Contingency [Line Items]
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, upper bound	$ 18,900,000