Shareholders' Equity (Details) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Aug. 06, 2015
Equity [Abstract]
Authorized stock repurchase amount					$ 100,000,000
Remaining authorized stock repurchase amount	$ 62,500,000		$ 62,500,000
Shares of common stock repurchased	678,300	0	678,300	0
Value of common stock repurchased	$ 37,457,000	$ 0	$ 37,457,000	$ 0