Income Taxes Change in Valuation Allowance (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in Tax Valuation Allowance [Abstract]
Unrecognized Tax Benefits, Interest on Income Taxes Expense									$ 5,700	$ 3,500
Income Tax Expense (Benefit)	$ (490)	$ 1,845	$ 1,077	$ 1,082	$ 208	$ (165)	$ 1,153	$ 2	3,514	1,200	$ 4,020
Deferred Tax Liability, Tax Valuation Allowance	0				0				0	0	0	$ 0
Other Comprehensive Income, Tax Valuation Allowance	0				0				0	0	(42)	(63)
Goodwill, Tax Valuation Allowance	1,058				1,058				1,058	1,058	1,058	1,058
Income Tax Expense (Benefit), Tax Valuation Allowance	$ (1,058)				$ (1,058)				(1,058)	(1,058)	(1,016)	$ (995)
Deferred Tax Liability, Release of Tax Valuation Allowance									0	0	0
Other Comprehensive Income, Release of Tax Valuation Allowance									0	42	21
Goodwill, Release of Tax Valuation Allowance									0	0	0
Income Tax Expense (Benefit), Release of Tax Valuation Allowance									$ 0	$ (42)	$ (21)