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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On July 11, 2017, the Company entered into an Amended and Restated Committed Line of Credit Note to increase the existing bank line and letter of credit availability to $300 million. There were no other changes to the terms of the line of credit and amounts drawn under the line of credit remain payable upon demand. The proceeds available under the facility will be used for general corporate purposes. The Company evaluated all other subsequent events through the filing date of this Form 10-Q. There were no other events or transactions occurring during this subsequent reporting period which require recognition or additional disclosure in these financial statements.