Stock Repurchase Program (Details) - USD ($)	3 Months Ended	4 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2015	Jun. 30, 2015	Nov. 30, 2012
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock, value			$ 7,299,000
Stock repurchase program, remaining amount	$ 57,300,000	$ 57,300,000	$ 57,300,000
Share Repurchase Program, November 2012 [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount					$ 25,000,000
Repurchase of common stock, shares	2,404		549,723
Repurchase of common stock, value			$ 7,300,000
Repurchase of common stock, average price per share (in dollars per share)	$ 16.44		$ 13.28
Share Repurchase Program, June 2015 [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount				$ 50,000,000
Repurchase of common stock, shares		0