CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net (loss) income	$ (3,734)	$ 2,936
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation and amortization	19,797	21,700
Stock-based compensation expense	499	487
Gain on sale of property and equipment	(2,311)	(2,217)
Unrealized loss on interest rate swap	4,970	1,447
Other non-cash items	1,821	80
Changes in assets and liabilities:
Accounts receivable	(13,911)	(24,722)
Contract assets	(15,682)	(2,328)
Other current assets	(4,849)	(2,231)
Other long-term assets	204	182
Accounts payable	23,934	(59,198)
Contract liabilities	(15,389)	2,590
Operating lease assets and liabilities, net	119	(1,447)
Accrued liabilities	(179)	(9,663)
Other long-term liabilities	(756)	288
Net cash used in operating activities	(5,467)	(72,096)
Cash flows from investing activities:
Purchase of property and equipment	(9,311)	(14,377)
Proceeds from sale of property and equipment	6,902	4,398
Net cash used in investing activities	(2,409)	(9,979)
Cash flows from financing activities:
Borrowings under revolving line of credit		40,000
Payments on revolving line of credit		(40,000)
Proceeds from issuance of long-term debt	6,800	23,105
Repayment of long-term debt	(14,976)	(17,170)
Proceeds from issuance of common stock purchased under a long-term incentive plan	578	1,804
Repurchase of common stock	(7,393)
Dividends paid	(2,919)	(3,043)
Other	(1,285)	(26)
Net cash (used in) provided by financing activities	(19,195)	4,670
Effect of exchange rate changes on cash and cash equivalents	259	327
Net change in cash and cash equivalents	(26,812)	(77,078)
Cash and cash equivalents at beginning of the year	120,286	151,063
Cash and cash equivalents at end of the year	93,474	73,985
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for interest	4,061	4,065
Cash paid for income taxes, net of refunds received	(369)	(707)
Leased assets obtained in exchange for new operating leases	34,711	8,847
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES
Dividends declared and not yet paid	$ 2,895	$ 3,051