Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
OPERATING ACTIVITIES:
Net Loss	$ (1,304)	$ 8,301
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation	14,295	13,187
Bad debt expense	239	69
Stock compensation-net of excess tax benefits	305	306
(Benefit from) provision for deferred income taxes	(498)	2,729
Recognized loss (gain) on marketable equity securities	9,339	(3,184)
Loss/(gain) on disposition of equipment	1	(425)
Changes in operating assets and liabilities:
Accounts receivable	(5,053)	(5,356)
Prepaid expenses, deposits, inventories, and other assets	(530)	1,269
Income taxes refundable		75
Trade accounts payable	8,048	199
Accrued expenses and other liabilities	(1,339)	2,567
Net cash provided by operating activities	23,503	19,737
INVESTING ACTIVITIES:
Purchases of property and equipment	(23,158)	(7,926)
Proceeds from disposition of equipment	5,325	5,787
Purchases of marketable equity securities, net of return of capital	(3,026)	(72)
Net cash used in investing activities	(20,859)	(2,211)
FINANCING ACTIVITIES:
Borrowings under line of credit	137,243	131,387
Repayments under line of credit	(128,657)	(133,442)
Borrowings of long-term debt		5,789
Repayments of long-term debt	(13,670)	(19,480)
Borrowings under margin account	3,753	166
Repayments under margin account	(985)	(324)
Repurchases of common stock	(321)	(1,618)
Net cash used in financing activities	(2,637)	(17,522)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	7	4
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -Beginning of period	318	282
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -End of period	325	286
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest	2,185	2,037
Income taxes		15
NONCASH INVESTING AND FINANCING ACTIVITIES:
Purchases of property and equipment included in accounts payable	$ 2,239	$ 4,025