Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Reconciliation of net loss to net cash provided by operating activities:
Net loss	$ (11,714)	$ (23,015)
Depreciation and amortization	18,392	44,232
Impairment of goodwill	4,496	0
Deferred income tax benefit	(977)	(585)
Foreign currency exchange losses (gains)	(1,112)	85
Amortization of deferred financing costs	692	627
Amortization of stock-based compensation	3	6
Gain on sale of seismic data and property and equipment	(54)	(96)
Non-cash revenue	(97)	(1,407)
Decrease in receivables	13,517	6,441
Increase in other assets	(1,434)	(165)
Increase (decrease) in deferred revenue	2,451	(2,888)
Decrease in accounts payable and other liabilities	(5,228)	(2,381)
Net cash provided by operating activities	18,935	20,854
Cash flows from investing activities:
Cash invested in seismic data	(13,991)	(16,101)
Cash paid to acquire property and equipment	(173)	(250)
Cash from sale of seismic data and property and equipment	58	3
Advances to Seitel Holdings, Inc.	(7)	(8)
Net cash used in investing activities	(14,113)	(16,356)
Cash flows from financing activities:
Principal payments on capital lease obligations	(138)	(112)
Net cash used in financing activities	(138)	(112)
Effect of exchange rate changes	(112)	460
Net increase in cash and cash equivalents	4,572	4,846
Cash and cash equivalents at beginning of period	70,581	55,997
Cash and cash equivalents at end of period	75,153	60,843
Supplemental disclosure of cash flow information:
Interest	11,946	11,940
Income taxes, net of refunds received	3,681	690
Supplemental schedule of non-cash investing and financing activities:
Additions to seismic data library	$ 0	$ 1,250