Derivatives and Hedging Activities - Narrative (Details) - USD ($) |
12 Months Ended | |||
---|---|---|---|---|
Sep. 06, 2017 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Sep. 22, 2015 |
|
Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||||
Payment to terminate existing interest rate swap contract | $ 1,100,000 | |||
Derivative liability, notional amount | $ 433,000,000 | $ 153,600,000 | $ 100,000,000 | |
Derivative, fixed interest rate | 1.94% | |||
Hedge ineffectiveness | $ 0 | $ 0 |