Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net loss	$ (124,815)	$ (91,182)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	13,570	16,039
Loss on sale of assets	5,273
Amortization of stock-based compensation	1,112	1,498
Amortization and write-off of deferred financing costs	10,283	806
Impairment		116,657
Provision for doubtful accounts receivable, net of write-offs	546	23
Gain on extinguishment of debt		(10,120)
Deferred income tax expense (benefit)	73,216	(35,624)
Foreign currency transaction (gain) loss	298	(223)
Change in operating assets and liabilities:
Accounts receivable	1,558	12,859
Prepaids and other	(1,009)	659
Accounts payable	(1,535)	2,573
Other accrued liabilities and other	10,126	(13,865)
Net cash (used in) provided by operating activities	(11,377)	100
Cash flows from investing activities:
Purchases of vessels, equipment and other fixed assets	(24,377)	(7,200)
Proceeds from disposition of vessels and equipment	3,000	29
Net cash used in investing activities	(21,377)	(7,171)
Cash flows from financing activities:
Proceeds from borrowings under revolving loan facility	58,468	15,000
Repayments of borrowings under revolving loan facility	(2,000)
Repayment of Senior Notes		(9,880)
Debt issuance costs	(4,299)	(769)
Proceeds from issuance of stock		121
Net cash provided by financing activities	52,169	4,472
Effect of exchange rate changes on cash	(96)	329
Net increase (decrease) in cash and cash equivalents	19,319	(2,270)
Cash and cash equivalents at beginning of period	8,822	21,939
Cash and cash equivalents at end of period	28,141	19,669
Supplemental cash flow information:
Interest paid, net of interest capitalized	756	15,353
Income taxes paid, net	$ 613	$ 449