Sale of Additional Common Stock (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2013
Proceeds from sale of common stock		$ 115,204	$ 72,507
Common Stock
Sale of common stock	8,625,000	8,625,000	14,639,500
Proceeds from sale of common stock	$ 115,200	$ 86	$ 146

Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

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