Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 28,141	$ 8,822
Trade accounts receivable, net of allowance for doubtful accounts of $3,048 and $2,482, respectively	18,916	22,043
Other accounts receivable	8,828	7,650
Inventory	7,442	7,465
Prepaid expenses	6,189	3,799
Other current assets	1,837	3,110
Total current assets	71,353	52,889
Vessels, equipment, and other fixed assets at cost, net of accumulated depreciation of $479,146 and $468,817, respectively	1,001,788	970,522
Construction in progress	1,367	24,698
Deferred costs and other assets	2,063	5,794
Total assets	1,076,571	1,053,903
Current liabilities:
Current maturities of long term debt	546,044	483,326
Accounts payable	10,204	11,666
Income and other taxes payable	2,991	3,678
Accrued personnel costs	10,224	9,109
Accrued interest expense	15,367	8,163
Other accrued liabilities	6,313	9,305
Total current liabilities	591,143	525,247
Long-term income taxes:
Deferred income tax liabilities	124,300	58,094
Other income taxes payable	18,680	17,768
Other liabilities	3,008	3,173
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; 29,080 and 29,104 shares issued and 27,021 and 27,122 outstanding, respectively; Class B Common Stock $0.01 per value; 60,000 shares authorized; no shares issued	287	278
Additional paid-in capital	409,346	411,983
Retained earnings	122,322	241,207
Accumulated other comprehensive income (loss)	(141,836)	(148,402)
Treasury stock, at cost	(59,874)	(64,580)
Deferred compensation expense	9,195	9,135
Total stockholders' equity	339,440	449,621
Total liabilities and stockholders' equity	$ 1,076,571	$ 1,053,903