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Derivatives - Offsetting Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Gross Amounts	$ 5,286	$ 5,582
Gross Amounts Offset	0	(4,272)
Amounts Net of Offset	5,286	1,310
Financial Collateral	0	0
Net Amount	5,286	1,310
LIABILITIES
Gross Amounts		18,467
Gross Amounts Offset		(4,272)
Amounts Net of Offset		14,195
Financial Collateral		(14,195)
Net Amount		0
Derivative contracts - current
ASSETS
Gross Amounts	5,286	5,582
Gross Amounts Offset	0	(4,272)
Amounts Net of Offset	5,286	1,310
Financial Collateral	0	0
Net Amount	$ 5,286	1,310
Derivative contracts - current
LIABILITIES
Gross Amounts		14,899
Gross Amounts Offset		(4,272)
Amounts Net of Offset		10,627
Financial Collateral		(10,627)
Net Amount		0
Derivative contracts - noncurrent
LIABILITIES
Gross Amounts		3,568
Gross Amounts Offset		0
Amounts Net of Offset		3,568
Financial Collateral		(3,568)
Net Amount		$ 0

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