Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Debt (Convertible Debt) (Narrative) (Details) - Convertible Debt [Member] - USD ($)	Sep. 30, 2016	Dec. 31, 2015	Dec. 10, 2013	Aug. 01, 2013	Jul. 29, 2013
Debt Instrument [Line Items]
Aggregate balance outstanding	$ 1,000,000,000	$ 1,000,000,000
2018 Convertible Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued			$ 287,500,000.0	$ 10,000,000.0	$ 300,000,000.0
Aggregate balance outstanding	597,500,000
2020 Convertible Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued			$ 402,500,000.0
Aggregate balance outstanding	$ 402,500,000