Long-Term Debt - Repurchases of Debt Securities (Details) - Convertible Notes Payable - 4.625% convertible notes due 2026 - USD ($) $ in Millions	Apr. 15, 2016	Mar. 01, 2016
Debt Instrument [Line Items]
Principal amount of convertible notes repurchased		$ 55
Interest rate	4.625%
Repurchase price percentage	100.00%	100.00%

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant