Recent Accounting Standards Accounting Standard Adopted (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment of adopting ASU 2016-09		$ 97
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	$ 100
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment of adopting ASU 2016-09		(137)
Retained Earnings | Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment of adopting ASU 2016-09		$ 100