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Equity Offering (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 16, 2013
Equity Offering [Line Items] |  |  |  |  |
Proceeds from sale of common stock |  | $ 0 | $ 0 | $ 174,670 |
Common Stock [Member] |  |  |  |  |
Equity Offering [Line Items] |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 5,175,000 |  |  |  |
Stock Issued During Period, Value, Per Share Offering Price |  |  |  |  | $ 35.40
Stock Issuance Costs | $ 8,500 |  |  |  |
Proceeds from sale of common stock | $ 174,700 |  |  |  |

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- Definition The per share offering price of the common stock issued as a part of an equity offering during the period. + References No definition available. + Details
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- Definition Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration. + References 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 + Details
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