Consolidated Balance Sheets - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 21,939,000	$ 50,785,000
Trade accounts receivable, net of allowance for doubtful accounts of $1,480 and $2,506, respectively	40,838,000	88,721,000
Other accounts receivable	7,571,000	9,410,000
Prepaid expenses and other current assets	16,649,000	17,825,000
Total current assets	86,997,000	166,741,000
Vessels, equipment, and other fixed assets at cost, net of accumulated depreciation of $457,670 and $428,538, respectively	1,195,669,000	1,356,839,000
Construction in progress	$ 70,817,000	127,722,000
Goodwill		25,010,000
Intangibles, net of accumulated amortization of $18,741 in 2014	$ 0	15,861,000
Cash held in escrow		3,683,000
Deferred costs and other assets	$ 16,787,000	20,499,000
Total assets	1,370,270,000	1,716,355,000
Current liabilities:
Accounts payable	13,170,000	22,494,000
Income and other taxes payable	6,485,000	4,578,000
Accrued personnel costs	12,942,000	20,403,000
Accrued interest expense	9,620,000	9,610,000
Other accrued liabilities	5,316,000	10,338,000
Total current liabilities	47,533,000	67,423,000
Long-term debt	499,607,000	544,732,000
Long-term income taxes:
Deferred income tax liabilities	99,439,000	104,346,000
Other income taxes payable	21,351,000	24,730,000
Other liabilities	$ 4,032,000	$ 6,371,000
Stockholders' equity:
Preferred stock, $0.01 par value; 2,000 shares authorized; no shares issued
Class A Common stock, $0.01 par value; 60,000 shares authorized; 27,994 and 27,361 shares issued and 25,792 and 25,114 shares outstanding, respectively; Class B Common Stock $.01 par value; 60,000 shares authorized; no shares issued	$ 274,000	$ 271,000
Additional paid-in capital	417,289,000	410,641,000
Retained earnings	444,181,000	659,403,000
Accumulated other comprehensive income (loss)	(96,234,000)	(30,665,000)
Treasury stock, at cost	(75,922,000)	(78,441,000)
Deferred compensation	8,720,000	7,544,000
Total stockholders' equity	698,308,000	968,753,000
Total liabilities and stockholders' equity	$ 1,370,270,000	$ 1,716,355,000