Recently Issue Accounting Standards Recently Issued Accounting Standards (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 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	$ 881	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	$ 880	$ 591