Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 15,884	$ 50,874
Short-term investments	73,336	14,232
Accounts receivable – net
Trade	167,561	168,459
Other	11,252	14,006
Inventories of spare parts – net	52,988	56,698
Prepaid expenses	13,944	11,419
Income taxes receivable	942	950
Total current assets	335,907	316,638
Property and equipment – net	896,436	902,485
Right of use assets	144,198
Restricted cash and investments	19,789	19,781
Other assets	18,981	18,378
Deferred income taxes	4,521	4,944
Total assets	1,419,832	1,262,226
Current Liabilities:
Senior Notes issued March 17, 2014, net of debt issuance cost of $260	0	499,740
Accounts payable	38,854	50,289
Accrued and other current liabilities	31,208	45,292
Current portion of operating lease liabilities	26,544
Current maturities of long term debt	875	500,000
Total current liabilities	97,481	595,321
Long-term debt:
Term loan issued March 13, 2019, net of debt issuance costs of $5,609	63,516	0
Related party term loan issued September 28, 2018, net of debt issuance costs of $656 and $765, respectively	129,344	129,235
Deferred income taxes	55,098	59,178
Other long-term liabilities	3,324	5,059
Long-term operating lease liabilities	118,436
Total liabilities not subject to compromise	467,199	788,793
Liabilities subject to compromise	513,125
Total liabilities	980,324	788,793
Commitments and contingencies (Note 11)
Shareholders’ Equity:
Additional paid-in capital	314,818	314,316
Accumulated other comprehensive income (loss)	(3,138)	(3,952)
Retained earnings	126,246	161,487
Total shareholders’ equity	439,508	473,433
Total liabilities and shareholders’ equity	1,419,832	1,262,226
Voting Common Stock [Member]
Shareholders’ Equity:
Common stock	291	291
Non-Voting Common Stock [Member]
Shareholders’ Equity:
Common stock	1,291	1,291
Total shareholders’ equity	$ 1,291	$ 1,291