Share Repurchase Program - (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share Repurchase Program [Abstract]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	3,000		3,000
Stock Repurchased and Retired During Period, Shares	0	245	0	615
Shares available for future repurchase	711		711
Stock Repurchased During Period, Value	$ 0	$ 3,344	$ 0	$ 8,045
StockRepurchasedAndRetired-AveragePricePerShare	$ 0.00	$ 13.63	$ 0.00	$ 13.07