Common Stock (Details) (Share repurchase program approved September 5, 2012, USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	7 Months Ended
	Jun. 03, 2015	Jun. 03, 2015	Sep. 05, 2012
Equity, Class of Treasury Stock [Line Items]
Share repurchase program authorized amount			$ 50,000,000
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Shares repurchased, retired, and returned to an authorized by unissued status during the period		0.3
Average price of common shares repurchased (in usd per share)		$ 31.92
Value of shares repurchased	2,100,000	10,000,000
Remaining shares authorized to be repurchased, amount	$ 20,000,000	$ 20,000,000