Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Vessel revenues	$ 158,466	$ 190,436	$ 446,382
Non-vessel revenues	32,946	33,863	29,688
Revenues	191,412	224,299	476,070
Costs and expenses:
Operating expenses	120,537	131,658	219,260
Depreciation	98,733	93,071	82,566
Amortization	13,168	20,485	26,463
General and administrative expenses	47,597	43,358	48,297
Costs and Expenses, Total	280,035	288,572	376,586
Gain (loss) on sale of assets	(121)	54	44,060
Operating income (loss)	(88,744)	(64,219)	143,544
Gain on early extinguishment of debt	15,478	0	0
Other income (expense):
Interest income	2,203	1,490	1,525
Interest expense	(51,364)	(48,675)	(39,496)
Other income (expense), net	(396)	2,052	1,005
Nonoperating Income (Expense)	(34,079)	(45,133)	(36,966)
Income (Loss) before Income Taxes	(122,823)	(109,352)	106,578
Income tax expense (benefit)	(150,244)	(45,506)	39,757
Net income (loss)	$ 27,421	$ (63,846)	$ 66,821	[1]
Basic earnings (loss) per common share	$ 0.74	$ (1.76)	$ 1.87
Diluted earnings (loss) per common share	$ 0.73	$ (1.76)	$ 1.84
Weighted average basic shares outstanding	36,858	36,248	35,755
Weighted average diluted shares outstanding	37,664	36,248	36,302

[1] The Company's net income for 2017 was favorably impacted by U.S. tax reform legislation that was enacted in December 2017. As a result of tax reform, the Company recorded a benefit of $125,225 related to the repricing of its deferred tax liabilities. Such benefits were reduced primarily by tax expense related to credits that may not be utilized prior to their expiration. Excluding these one-time tax items from the Company's December 31, 2017 results, its net loss would have been $(82,687) or $(2.24) per diluted share for the year ended December 31, 2017. See Note 9 for further information.