Derivative Instruments - Fair Value of Derivative Instruments Balance Sheet Classification (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands |
Sep. 30, 2017 |
Dec. 31, 2016 |
| Derivative Assets |
|
|
| Gross Asset/Liability Amounts |
$ 808
|
$ 739
|
| Netting Adjustments |
(183)
|
(308)
|
| Net Recognized Fair Value Assets/Liabilities |
625
|
431
|
| Derivative Liabilities |
|
|
| Gross Asset/Liability Amounts |
633
|
5,689
|
| Netting Adjustments |
(183)
|
(308)
|
| Net Recognized Fair Value Assets/Liabilities |
450
|
5,381
|
| Current assets |
|
|
| Derivative Assets |
|
|
| Gross Asset/Liability Amounts |
562
|
739
|
| Netting Adjustments |
(179)
|
(308)
|
| Net Recognized Fair Value Assets/Liabilities |
383
|
431
|
| Noncurrent assets |
|
|
| Derivative Assets |
|
|
| Gross Asset/Liability Amounts |
246
|
|
| Netting Adjustments |
(4)
|
|
| Net Recognized Fair Value Assets/Liabilities |
242
|
|
| Current liabilities |
|
|
| Derivative Liabilities |
|
|
| Gross Asset/Liability Amounts |
629
|
5,669
|
| Netting Adjustments |
(179)
|
(308)
|
| Net Recognized Fair Value Assets/Liabilities |
450
|
5,361
|
| Noncurrent Liabilities |
|
|
| Derivative Liabilities |
|
|
| Gross Asset/Liability Amounts |
4
|
20
|
| Netting Adjustments |
(4)
|
0
|
| Net Recognized Fair Value Assets/Liabilities |
$ 0
|
$ 20
|