Income Taxes (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Valuation Allowance [Line Items]
Deferred Income Tax Expense (Benefit)	$ (46,063)	$ 14,162	$ 11,884
Net deferred tax liabilities comprised
Loss reserves and accruals	44,004	59,884
Interest rate swaps	259	5,598
Deferred Tax Assets, Goodwill and Intangible Assets	2,770	5,907
State net operating loss ("NOL") carryforwards	17,430	16,848
Deferred tax assets, depreciation expense	0	775
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	40,582	34,946
Deferred Tax Assets, Other	379	0
Deferred Tax Assets, Gross	105,424	123,958
Valuation allowance on state NOL	(54,415)	(53,946)
Deferred Tax Assets, Net of Valuation Allowance	51,009	70,012
Goodwill and intangible franchise rights	(118,447)	(160,439)
Depreciation expense	(50,166)	(64,465)
Deferred tax liabilities deferred gain on bond redemption	(327)	(1,023)
Other	(1,820)	(3,317)
Deferred Tax Liabilities, Gross	(170,760)	(229,244)
Deferred Tax Liabilities, Net	$ (119,751)	$ (159,232)