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Acquisitions (Details) $ / shares in Units, $ in Thousands, shares in Millions |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 21, 2016 USD ($) shares | Oct. 04, 2016 USD ($) | Oct. 15, 2014 USD ($) | Sep. 24, 2014 USD ($) a | Dec. 31, 2016 USD ($) a $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) a $ / shares | Dec. 31, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Wells in Progress |  |  |  |  |  | $ 235,147 | $ 235,147 | $ 387,432 |
Proved Oil and Gas Property, Successful Effort Method |  |  |  |  |  | 5,700,418 | 5,700,418 | 7,606,405 |
Unproved Oil and Gas Property, Successful Effort Method |  |  |  |  |  | 2,471,947 | 2,471,947 | 284,538 |
Asset Retirement Obligations, Noncurrent |  |  |  |  |  | $ (96,134) | $ (96,134) | $ (137,284) |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |
Payments to Acquire Oil and Gas Property and Equipment |  |  |  |  |  |  | $ 2,183,790 | $ 7,984 | $ 544,553
Value of common stock from issuance of private placement for an asset acquisition | [1] |  |  |  |  |  | $ 437,194 | 0 | $ 0
QStar Acquisition 2016 [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Wells in Progress |  | $ 21,812 |  |  |  |  |  |  |
Proved Oil and Gas Property, Successful Effort Method |  | 61,614 |  |  |  |  |  |  |
Unproved Oil and Gas Property, Successful Effort Method |  | 1,537,923 |  |  |  |  |  |  |
Oil and Gas Property, Successful Effort Method, Gross |  | 1,621,349 |  |  |  |  |  |  |
Working Capital Acquired |  | (9,141) |  |  |  |  |  |  |
Asset Retirement Obligations, Noncurrent |  | (7,641) |  |  |  |  |  |  |
Acquisition of Oil and Gas Property And Equipment, Consideration Transferred |  | $ 1,604,567 |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions | shares |  | 13.4 |  |  |  |  |  |  |
Payments to Acquire Oil and Gas Property and Equipment |  | $ 1,167,373 |  |  |  |  |  |  |
Value of common stock from issuance of private placement for an asset acquisition | [2] | 437,194 |  |  |  |  |  |  |
Noncash or Part Noncash Acquisition, Value of Assets Acquired |  | $ 1,604,567 |  |  |  |  |  |  |
Other Midland Basin Acquisition 2016 [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Net acres acquired | a |  |  |  |  |  | 2,900 |  |  |
Payments to Acquire Oil and Gas Property and Equipment |  |  |  |  |  | $ 60,000 |  |  |
Rocky Mountain Acquisition 2014 [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payments to Acquire Oil and Gas Property and Equipment |  |  |  |  |  |  |  | $ 135,500 |
Leasehold Acres Consideration to Acquire Unproved Property | a |  |  |  |  |  |  |  | 7,000 |
Gooseneck Second Prospect Acquisition 2014 [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  | $ 84,836 |  |  |  |  |
Proved Oil and Gas Property, Successful Effort Method |  |  |  | 54,612 |  |  |  |  |
Unproved Oil and Gas Property, Successful Effort Method |  |  |  | 29,610 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  | 84,222 |  |  |  |  |
Working Capital Acquired |  |  |  | 2,232 |  |  |  |  |
Asset Retirement Obligations, Noncurrent |  |  |  | (1,618) |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |  | $ 84,836 |  |  |  |  |
Gooseneck Prospect Acquisition 2014 [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  | $ 321,807 |  |  |  |
Proved Oil and Gas Property, Successful Effort Method |  |  |  |  | 203,467 |  |  |  |
Unproved Oil and Gas Property, Successful Effort Method |  |  |  |  | 126,588 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  | 330,055 |  |  |  |
Working Capital Acquired |  |  |  |  | (6,135) |  |  |  |
Asset Retirement Obligations, Noncurrent |  |  |  |  | (2,113) |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |  |  | $ 321,807 |  |  |  |
Net acres acquired | a |  |  |  |  | 61,000 |  |  |  |
Rock Oil Acquisition 2016 [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 991,038 |  |  |  |  |  |
Wells in Progress |  |  | 5,672 |  |  |  |  |  |
Proved Oil and Gas Property, Successful Effort Method |  |  | 81,917 |  |  |  |  |  |
Unproved Oil and Gas Property, Successful Effort Method |  |  | 913,594 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  | 5,338 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  | 1,006,521 |  |  |  |  |  |
Working Capital Acquired |  |  | (7,888) |  |  |  |  |  |
Asset Retirement Obligations, Noncurrent |  |  | (7,595) |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  | $ 991,038 |  |  |  |  |  |
[1] | Refer to Note 3 - Acquisitions, Divestitures, and Assets Held for Sale and Note 15 - Equity for additional discussion.
[2] | The Company issued approximately 13.4 million shares of common stock, par value $0.01 per share, in a private placement to the sellers in the QStar Acquisition on December 21, 2016. The equity consideration was valued on this date using Level 1 and Level 2 inputs with a discount applied due to the lack of marketability in the near term in accordance with the Lock-Up and Registration Rights Agreement that prohibits the sale of such stock until no earlier than the 90th day after issuance.

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