Stockholders' Equity - Narrative (Details) (USD $)	0 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 05, 2013	Mar. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Stock repurchase program, authorized amount	$ 200,000,000.0
Remaining amount for purchases under the repurchase program			75,000,000	104,500,000
Stock repurchased (in shares)		2,000,000		50,000
Stock repurchased value		29,500,000		800,000
Employee stock option
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Stock repurchased (in shares)				226,000
Stock repurchased value				$ 2,000,000