Schedule II - Valuation and Qualifying Accounts (Details) (Valuation reserve for deferred tax assets, USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Valuation reserve for deferred tax assets
Movement in Valuation Allowances and Reserves
Balance at Beginning of Year	$ 0	$ 0
Change	2,236	0
Balance at End of Year	$ 2,236	$ 0

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant