Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 8,822	$ 21,939
Trade accounts receivable, net of allowance for doubtful accounts of $2,482 and $1,480, respectively	22,043	40,838
Other accounts receivable	7,650	7,571
Inventory	7,465	8,485
Prepaid expenses	3,799	4,354
Other current assets	3,110	3,810
Total current assets	52,889	86,997
Vessels, equipment, and other fixed assets at cost, net of accumulated depreciation of $468,817 and $457,670, respectively	970,522	1,195,669
Construction in progress	24,698	70,817
Deferred costs and other assets	5,794	7,769
Total assets	1,053,903	1,361,252
Current liabilities:
Current maturities of long-term debt	483,326
Accounts payable	11,666	13,170
Income and other taxes payable	3,678	6,485
Accrued personnel costs	9,109	12,942
Accrued interest expense	8,163	9,620
Other accrued liabilities	9,305	5,316
Total current liabilities	525,247	47,533
Long-term debt		490,589
Long-term income taxes:
Deferred income tax liabilities	58,094	99,439
Other income taxes payable	17,768	21,351
Other liabilities	3,173	4,032
Stockholders' equity:
Preferred stock, $0.01 par value; 2,000 shares authorized; no shares issued	0	0
Class A Common stock, $0.01 par value; 60,000 shares authorized; 29,104 and 27,994 shares issued and 27,122 and 25,792 shares outstanding, respectively; Class B Common Stock $.01 par value; 60,000 shares authorized; no shares issued	278	274
Additional paid-in capital	411,983	417,289
Retained earnings	241,207	444,181
Accumulated other comprehensive income (loss)	(148,402)	(96,234)
Treasury stock, at cost	(64,580)	(75,922)
Deferred compensation	9,135	8,720
Total stockholders' equity	449,621	698,308
Total liabilities and stockholders' equity	$ 1,053,903	$ 1,361,252