Derivative Instruments (Details) - USD ($)
$ in Thousands |
|
12 Months Ended |
Dec. 20, 2017 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Derivative [Line Items] |
|
|
|
|
| Reduction of accumulated other comprehensive loss |
|
$ 1
|
$ 2
|
$ (3)
|
| Decreased interest expense on sale of derivatives |
|
(4,640)
|
(5,639)
|
$ (6,531)
|
| Interest rate swap | Cash flow hedging |
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
| Proceeds from sale of derivative instrument |
$ 400
|
|
|
|
| Increase (decrease) in derivative assets |
(400)
|
|
|
|
| Reduction of accumulated other comprehensive loss |
400
|
|
|
|
| Interest rate swap | Cash flow hedging | Designated as hedging instrument |
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
| Derivative, notional amount |
|
31,600
|
|
|
| Interest rate swap | Cash flow hedging | Designated as hedging instrument | Other accrued liabilities |
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
| Interest rate swap liabilities designated as cash flow hedge |
|
127
|
86
|
|
| Interest rate swap | Cash flow hedging | Designated as hedging instrument | Other non-current assets |
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
| Interest rate swap assets designated as cash flow hedge |
|
60
|
$ 259
|
|
| Foreign exchange forward |
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
| Derivative, notional amount |
|
5,752
|
|
|
| Gain (loss) on derivative instruments |
|
100
|
|
|
| Derivative, fair value |
|
$ 83
|
|
|
| Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income | Interest rate swap | Cash flow hedging |
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
| Decreased interest expense on sale of derivatives |
$ 400
|
|
|
|