Derivative Instruments - Summary of Effects of Cash Flow Hedges on Consolidated Statements of Operations (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gains (losses) recognized in accumulated OCI, Effective portion of change in fair value | $ 4,891 | $ (3,778) | $ 7,690 | $ (4,359) |
| Interest Expense [Member] | ||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gains (losses) reclassified from accumulated OCI into income | (1,295) | (2,400) | (2,957) | (4,970) |
| Gains (losses) recognized in interest expense, ineffective portion | 20 | 88 | 558 | 77 |
| Gain (Loss) on Derivative Instruments [Member] | ||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Gains (losses) reclassified from accumulated OCI into income | $ 1,529 | $ 0 | $ 1,529 | $ 0 |