Unaudited Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 32,663	$ 60,566
Trade accounts receivable, net of allowance for doubtful accounts of $2,504 and $448, respectively	102,728	100,173
Other accounts receivable	11,621	11,194
Prepaid expenses and other current assets	24,273	18,132
Total current assets	171,285	190,065
Vessels, equipment, and other fixed assets at cost, net of accumulated depreciation of $453,880 and $420,355, respectively	1,427,228	1,316,838
Construction in progress	122,000	177,773
Goodwill	28,979	30,676
Intangibles, net of accumulated amortization of $18,018 and $15,858, respectively	16,581	18,741
Cash held in escrow	3,683	8,742
Deferred costs and other assets	22,062	30,457
Total assets	1,791,818	1,773,292
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	27,720	27,229
Income and other taxes payable	5,507	3,340
Accrued personnel costs	22,620	19,624
Accrued interest expense	1,451	9,892
Other accrued liabilities	12,143	13,432
Total current liabilities	69,441	73,517
Long-term debt	518,959	500,864
Deferred tax liabilities	102,538	104,647
Other income taxes payable	24,668	23,673
Other liabilities	6,390	7,250
Additional paid-in capital	408,734	402,286
Retained earnings	658,339	623,221
Accumulated other comprehensive income	25,454	49,965
Treasury stock, at cost	(30,610)	(18,690)
Deferred compensation expense	7,635	6,290
Total stockholders' equity	1,069,822	1,063,341
Total liabilities and stockholders' equity	1,791,818	1,773,292
Class A Common Stock, $0.01 par value; 60,000 shares authorized; 27,276 and 27,165 shares issued and 26,723 and 26,616 outstanding, respectively; Class B Common Stock $0.01 per value; 60,000 shares authorized; no shares issued	$ 270	$ 269