Interest Rate Swap	9 Months Ended
Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Interest Rate Swap	Interest Rate Swap To reduce the effect of interest rate fluctuations, the Company entered into an interest rate swap contract with a counter party to make a series of payments based on a fixed interest rate of 1.78% and receive a series of payments based on the greater of LIBOR or 0.75%. Both the fixed and floating payment streams are based on a notional amount of $500 million at the inception of the contract and will be reduced by $100 million each year of the five-year contract. As of September 30, 2018, the notional amount is $400 million. The Company entered into this transaction to reduce its exposure to changes in cash flows associated with its variable rate debt and has designated this derivative as a cash flow hedge. At September 30, 2018, the effective interest rate on the long-term debt hedged by this contract was 4.03%. As of September 30, 2018 and December 31, 2017, the fair value of the interest rate swap contract of $8.5 million and $2.9 million was reported within other assets, net on the consolidated balance sheet. The fair value of the interest rate swap contract is measured on a recurring basis by netting the discounted future fixed cash payments and the discounted expected variable cash receipts. The variable cash receipts are based on the expectation of future interest rates (forward curves) derived from observable market interest rate curves (Level 2).

Interest Rate Swap

To reduce the effect of interest rate fluctuations, the Company entered into an interest rate swap contract with a counter party to make a series of payments based on a fixed interest rate of 1.78% and receive a series of payments based on the greater of LIBOR or 0.75%. Both the fixed and floating payment streams are based on a notional amount of $500 million at the inception of the contract and will be reduced by $100 million each year of the five-year contract. As of September 30, 2018, the notional amount is $400 million. The Company entered into this transaction to reduce its exposure to changes in cash flows associated with its variable rate debt and has designated this derivative as a cash flow hedge. At September 30, 2018, the effective interest rate on the long-term debt hedged by this contract was 4.03%.

As of September 30, 2018 and December 31, 2017, the fair value of the interest rate swap contract of $8.5 million and $2.9 million was reported within other assets, net on the consolidated balance sheet. The fair value of the interest rate swap contract is measured on a recurring basis by netting the discounted future fixed cash payments and the discounted expected variable cash receipts. The variable cash receipts are based on the expectation of future interest rates (forward curves) derived from observable market interest rate curves (Level 2).