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Debt Commitments and Contingencies - Debt Obligations and Undrawn Letters of Credit Outstanding (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt | $ 365,000 | $ 90,000
Less: Current portion of debt | (62,050) | (90,000)
Long-term debt | 302,950 | 0
Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 350,000 | 90,000
Credit Facility [Member] | Letter of Credit Subfacility [Member] |  |
Debt Instrument [Line Items] |  |
Undrawn letters of credit under unsecured revolving credit facility - face amount | 36,266 | 37,315
Note [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 15,000 | $ 0

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