Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014
Capital Surplus [Member]
Net issuance cost	$ 4,811	$ 0

Amount of increase in additional paid in capital (APIC) resulting from issuance costs from a share-lending arrangement entered into, in contemplation of a convertible debt offering or other financing.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 25

-Paragraph 20A

-URI http://asc.fasb.org/extlink&oid=28183637&loc=SL6757427-112606

Name:	us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedOwnshareLendingArrangementIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration