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Letters of Credit	12 Months Ended
Letters of Credit	Dec. 31, 2016
Financial Instruments Pledged as Collateral [Abstract]
Letters of Credit	Letters of Credit As of December 31, 2016 and 2015, the Company had a $25.2 million and $25.1 million unsecured standby letter of credit facility, of which $19.7 million and $13.0 million had been drawn upon for issued letters of credit, respectively.