Stockholders' Equity (Narrative) (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Aug. 06, 2015
Business Acquisition [Line Items]
Share repurchase program, authorized amount			$ 100,000,000
Shares repurchased (in shares)	0	226,170
Cost of common shares repurchased		$ 9,400,000
Share repurchase, average price per share (in dollars per share)		$ 41.43
Stock repurchase program, remaining authorized amount	$ 85,600,000	$ 85,600,000