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Debt Commitments and Contingencies - Debt Obligations and Undrawn Letters of Credit Outstanding (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total debt $ 370,000 $ 365,000
Less: Current portion of debt (7,610) (62,050)
Long-term debt 362,390 302,950
Credit Facility [Member] | Unsecured Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Total debt 355,000 350,000
Credit Facility [Member] | Letter of Credit Subfacility [Member]    
Debt Instrument [Line Items]    
Undrawn letters of credit under unsecured revolving credit facility - face amount 36,267 36,266
Note Payable [Member]    
Debt Instrument [Line Items]    
Total debt $ 15,000 $ 15,000