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Subsequent Events
6 Months Ended
Jun. 30, 2017
Subsequent Events [Abstract]  
Subsequent Events
15. Subsequent Events

Entry into interest rate swap agreement
In July 2017, we entered into an additional interest rate swap agreement (the "July 2017 Swap Agreement"), which effectively converts portions of our variable rate debt under our credit facility to a fixed rate for the term of the swap agreement. The notional value of the July 2017 Swap Agreement was $150.0 million with an effective date beginning in July 2017 through July 2021. We designated the July 2017 Swap Agreement as a cash flow hedge at the inception of the contract. See Note 9 to these consolidated financial statements for information on our other interest rate swap agreements.