Recently Issue Accounting Standards Recently Issued Accounting Standards (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting for stock compensation forfeitures		$ 0
Stock compensation withheld - value	$ 814	592
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting for stock compensation forfeitures		185
Stock compensation withheld - value	$ 813	$ 591