Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 50,874	$ 8,770
Short-term investments	14,232	64,237
Accounts receivable – net
Trade	168,459	168,153
Other	14,006	17,826
Inventories of spare parts – net	56,698	80,881
Prepaid expenses	11,419	11,475
Income taxes receivable	950	1,271
Total current assets	316,638	352,613
Property and equipment – net	902,485	946,765
Restricted cash and investments	19,781	12,396
Other assets	18,378	8,741
Deferred income taxes	4,944	3,309
Goodwill	0	61,299
Intangibles	0	16,723
Total assets	1,262,226	1,401,846
Current Liabilities:
Senior Notes issued March 17, 2014, net of unamortized debt issuance costs of $260	499,740	0
Accounts payable	50,289	37,186
Accrued and other current liabilities	45,292	41,850
Total current liabilities	595,321	79,036
Long-term debt:
Revolving credit facility	0	117,500
Senior Notes issued March 17, 2014, net of unamortized debt issuance costs of $1,506	0	498,494
Related Party Term Loan issued September 28, 2018, net of debt issuance costs of $765	129,235	0
Deferred income taxes	59,178	86,005
Other long-term liabilities	5,059	8,157
Commitments and contingencies (Note 13)
Shareholders’ Equity:
Additional paid-in capital	314,316	308,353
Accumulated other comprehensive loss	(3,952)	(280)
Retained earnings	161,487	303,001
Total shareholders’ equity	473,433	612,654
Total liabilities and shareholders’ equity	1,262,226	1,401,846
Voting Common Stock [Member]
Shareholders’ Equity:
Common stock	291	291
Non-Voting Common Stock [Member]
Shareholders’ Equity:
Common stock	$ 1,291	$ 1,289