Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended			9 Months Ended		10 Months Ended
	Nov. 07, 2016	Oct. 31, 2016	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Nov. 07, 2016
Subsequent Event [Line Items]
Cash dividends declared per common share (in dollars per share)			$ 0.18	$ 0.16	$ 0.16	$ 0.52	$ 0.460
Estimated total cash dividend				$ 7,567		$ 24,996	$ 22,657
Subsequent Event
Subsequent Event [Line Items]
Cash dividends declared per common share (in dollars per share)		$ 0.18
Estimated total cash dividend		$ 8,600
Dividends payable, date to be paid		Jan. 26, 2017
Dividends payable, date of record		Jan. 05, 2017
Number of shares purchased (in shares)								1,244,003
Subsequent Event | Accelerated Share Repurchase Program
Subsequent Event [Line Items]
Number of shares purchased (in shares)	154,156							1,137,656
Stock repurchase program, authorized amount	$ 50,000							$ 50,000
Stock Repurchased During Period, Value								$ 53,500