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Significant Accounting Policies Accounting principles (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Liability	$ 14,043
Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	$ 4,300	$ (6,200)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Basic Earnings Per Share	$ 0.17	$ (0.25)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share	0.17	$ (0.25)
Cumulative Effect on Retained Earnings, Net of Tax		$ 0
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Basic Earnings Per Share	(0.01)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share	$ (0.01)
Cumulative Effect on Retained Earnings, Net of Tax	$ 595
Operating Lease, Right-of-Use Asset			$ 7,200
Operating Lease, Liability			$ 7,200
Retained Earnings \| Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets				$ 5,500
Cumulative Effect on Retained Earnings, Net of Tax		$ 5,480
Retained Earnings \| Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax	$ 595