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CONSOLIDATED STATEMENTS OF CASH FLOWS Parenthetical - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Other Significant Noncash Transactions [Line Items] |  |  |  |  |
Capital Expenditures Incurred but Not yet Paid - Instant |  |  | $ 97,355 | $ 357,156 |
Accounts Payable and Accrued Liabilities [Member] |  |  |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |  |  |
Capital Expenditures Incurred but Not yet Paid - Instant |  |  | $ 97,400 | $ 357,200 | $ 217,800
Rocky Mountain Acquisition 2014 [Member] |  |  |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |  |  |
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) | $ 6,200 |  |  |  |
Rocky Mountain Non-Cash Asset Trade 2013 [Member] |  |  |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |  |  |
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) |  | $ 25,000 |  |  |

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