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Debt Commitments and Contingencies - Debt Obligations and Letters of Credit Outstanding (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt | $ 390,000 | $ 365,000
Less: Current portion of debt | (10,482) | (62,050)
Long-term debt | 379,518 | 302,950
Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 305,000 | 350,000
Credit Facility [Member] | Letter of Credit Subfacility [Member] |  |
Debt Instrument [Line Items] |  |
Outstanding letters of credit under unsecured revolving Credit Facility - contingent obligation | 36,267 | 36,266
Senior Unsecured Promissory Notes [Member] | 2.00% Senior Unsecured Promissory Note Payable [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 40,000 | 0
Senior Unsecured Promissory Notes [Member] | 2.45% Senior Unsecured Promissory Note Payable [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 35,000 | 0
Note Payable Under Asset Purchase Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 10,000 | $ 15,000

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