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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
$ in Thousands
 3 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Cash flows from operating activities:    
Net (loss) income $ (1,674) $ 5,848
Adjustments to reconcile net (loss) income to net cash provided by operating activities (net of effect of acquisitions):    
Depreciation and amortization 20,172 24,852
Stock-based compensation expense 1,553 6,152
Gain on sale of property and equipment (4,538) (2,743)
Unrealized gain on interest rate swap (2,896) (1,283)
Other non-cash items 345 151
Changes in assets and liabilities:    
Accounts receivable 25,691 10,321
Contract assets (45,972) (7,546)
Other current assets (32,570) (14,216)
Other long-term assets (12,826) (153)
Accounts payable 12,114 186
Contract liabilities 51,969 (13,625)
Operating lease assets and liabilities, net (255) (1,343)
Accrued liabilities (4,524) 2,406
Other long-term liabilities (12) (1,034)
Net cash provided by operating activities 6,577 7,973
Cash flows from investing activities:    
Purchase of property and equipment (33,165) (19,078)
Proceeds from sale of assets 4,354 2,091
Cash paid for acquisitions, net of cash acquired (4,063) (613,224)
Net cash used in investing activities (32,874) (630,211)
Cash flows from financing activities:    
Borrowings under revolving line of credit   100,000
Payments on revolving line of credit   (100,000)
Proceeds from issuance of long-term debt 30,000 400,000
Payments on long-term debt (26,462) (59,353)
Proceeds from issuance of common stock 422 178,863
Debt issuance costs   (4,876)
Dividends paid (3,192) (2,887)
Other (1,994) (3,283)
Net cash (used in) provided by financing activities (1,226) 508,464
Effect of exchange rate changes on cash, cash equivalents and restricted cash 502 259
Net change in cash, cash equivalents and restricted cash (27,021) (113,515)
Cash, cash equivalents and restricted cash at beginning of the period 205,643 330,975
Cash, cash equivalents and restricted cash at end of the period 178,622 217,460
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION    
Cash paid for interest 5,489 5,875
Cash paid for income taxes, net of refunds received (347) (1,728)
Leased assets obtained in exchange for new operating leases 3,411 4,671
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES    
Dividends declared and not yet paid $ 3,198 $ 3,223