Share Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accelerated Share Repurchases [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		3,000
Stock Repurchased and Retired During Period, Shares	615	1,674	1,353
Stock Repurchased and Retired During Period, Value	$ 8,044	$ 20,668	$ 12,845,000
Stock repurchase and retired average price per share	$ 13.07	$ 12.35	$ 9.49
Document Period End Date	Dec. 31, 2016
Shares available for future repurchase	711