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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (Parenthetical)	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
1 Percent Convertible Senior Notes [Member]
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Interest rate on convertible senior notes	1.00%	1.00%
2 3/4 Percent Convertible Senior Notes [Member]
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Interest rate on convertible senior notes	2.75%	2.75%	2.75%