Supplemental Disclosures to the Condensed Consolidated Balance Sheets and Condensed Consolidated Statements of Cash Flows - Supplemental Disclosures to the Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Supplemental Disclosures of Significant Non-Cash Investing Activities:
(Increase) decrease in accrued liabilities related to purchases of property and equipment	$ 2,038	$ (4,144)
Supplemental Disclosures of Cash Payments (Receipts):
Interest, net of amounts capitalized	14,000	2,654
Reorganization items, net	$ 0	$ 468

Supplemental Disclosures to the Condensed Consolidated Balance Sheets and Condensed Consolidated Statements of Cash Flows - Supplemental Disclosures to the Statements of Cash Flows (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Supplemental Disclosures of Significant Non-Cash Investing Activities:

(Increase) decrease in accrued liabilities related to purchases of property and equipment

$ 2,038

$ (4,144)

Supplemental Disclosures of Cash Payments (Receipts):

Interest, net of amounts capitalized

14,000

2,654

Reorganization items, net

$ 0

$ 468