Stockholders' Equity - Repurchase Program (Details) - USD ($)		9 Months Ended
	Feb. 04, 2016	Sep. 30, 2016	Sep. 30, 2015
Class of Stock [Line Items]
Shares repurchased (in shares)		259,145
Repurchase of common stock		$ 35,492,000	$ 0
Common Stock
Class of Stock [Line Items]
Stock repurchase program, approved amount	$ 500,000,000
Stock repurchase program, authorized time period	18 months