Risk Management and Derivative Instruments- Balance Sheet Presentation (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Total derivative financial instruments - current liabilities	$ (908)
Total derivative financial instruments - noncurrent liabilities	(251)	$ (80)
Commodity Derivatives | Not designated as Hedging Instrument
Total derivative financial instruments - current assets	309	6,940
Total derivative financial instruments - noncurrent assets		791
Total derivative financial instruments - current liabilities	(908)
Total derivative financial instruments - noncurrent liabilities	(251)	(80)
Total derivative fair value at period end	(850)	7,651
Derivative assets:
Gross Recognized Assets	2,643	13,925
Gross Amounts Offset, Assets	(2,334)	(6,194)
Net Recognized Fair Value Assets	309	7,731
Derivative liabilities:
Gross Recognized Liabilities	(3,493)	(6,274)
Gross Amounts Offset, Liabilities	2,334	6,194
Net Recognized Fair Value Liabilities	(1,159)	(80)
Current Assets | Commodity Derivatives | Not designated as Hedging Instrument
Derivative assets:
Gross Recognized Assets	1,738	11,066
Gross Amounts Offset, Assets	(1,429)	(4,126)
Net Recognized Fair Value Assets	309	6,940
Current Assets | Commodity Derivatives | Not designated as Hedging Instrument | Swap | Oil
Total derivative financial instruments - current assets	422	3,806
Current Assets | Commodity Derivatives | Not designated as Hedging Instrument | Swap | Natural gas
Total derivative financial instruments - current assets		(207)
Current Assets | Commodity Derivatives | Not designated as Hedging Instrument | Collars | Oil
Total derivative financial instruments - current assets	(113)	3,316
Current Assets | Commodity Derivatives | Not designated as Hedging Instrument | Collars | Natural gas
Total derivative financial instruments - current assets		25
Non-Current Assets | Commodity Derivatives | Not designated as Hedging Instrument
Derivative assets:
Gross Recognized Assets	905	2,859
Gross Amounts Offset, Assets	(905)	(2,068)
Net Recognized Fair Value Assets		791
Non-Current Assets | Commodity Derivatives | Not designated as Hedging Instrument | Collars | Oil
Total derivative financial instruments - noncurrent assets		791
Current Liabilities | Commodity Derivatives | Not designated as Hedging Instrument
Derivative liabilities:
Gross Recognized Liabilities	(2,337)	(4,126)
Gross Amounts Offset, Liabilities	1,429	4,126
Net Recognized Fair Value Liabilities	(908)
Current Liabilities | Commodity Derivatives | Not designated as Hedging Instrument | Swap | Natural gas
Total derivative financial instruments - current liabilities	(6)
Current Liabilities | Commodity Derivatives | Not designated as Hedging Instrument | Collars | Oil
Total derivative financial instruments - current liabilities	(823)
Current Liabilities | Commodity Derivatives | Not designated as Hedging Instrument | Collars | Natural gas
Total derivative financial instruments - current liabilities	(79)
Non-Current Liabilities | Commodity Derivatives | Not designated as Hedging Instrument
Derivative liabilities:
Gross Recognized Liabilities	(1,156)	(2,148)
Gross Amounts Offset, Liabilities	905	2,068
Net Recognized Fair Value Liabilities	(251)	(80)
Non-Current Liabilities | Commodity Derivatives | Not designated as Hedging Instrument | Collars | Oil
Total derivative financial instruments - noncurrent liabilities	$ (251)
Non-Current Liabilities | Commodity Derivatives | Not designated as Hedging Instrument | Collars | Natural gas
Total derivative financial instruments - noncurrent liabilities		$ (80)