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CONSOLIDATED STATEMENTS OF CASH FLOWS
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Cash flows from operating activities:      
Net income $ 87,593 $ 76,850 $ 27,725
Adjustments to reconcile net income to net cash provided by operating activities (net of effect of acquisitions):      
Depreciation 67,948 57,614 61,433
Amortization of intangible assets 11,302 8,689 6,597
Goodwill and intangible asset impairment   477 2,716
Stock-based compensation expense 1,253 1,126 1,627
Gain on short-term investments   (5,817)  
Gain on sale of property and equipment (3,556) (4,434) (4,677)
Other non-cash items 275 203 174
Changes in assets and liabilities:      
Accounts receivable 20,912 60,739 (50,809)
Contract assets (67,593) (32,137) (18,455)
Other current assets (2,278) 7,507 903
Net deferred tax liabilities (assets) 17,155 3,741 10,905
Other long-term assets 244 28 (1,792)
Accounts payable 32,323 (30,547) 42,934
Contract liabilities (43,801) 42,610 (21,601)
Accrued liabilities 5,933 1,915 8,574
Other long-term liabilities (895) 378 (3,677)
Net cash provided by operating activities 126,815 188,942 62,577
Cash flows from investing activities:      
Purchase of property and equipment (110,189) (79,782) (58,027)
Issuance of a note receivable (15,000)    
Proceeds from a note receivable 15,000    
Proceeds from sale of property and equipment 11,657 8,736 9,603
Purchase of short-term investments   (13,588)  
Sale of short-term investments   19,405  
Cash paid for acquisitions, net of cash and restricted cash acquired (110,620) (66,205) (10,997)
Net cash used in investing activities (209,152) (131,434) (59,421)
Cash flows from financing activities:      
Borrowings under revolving line of credit 190,000    
Payments on revolving line of credit (190,000)    
Proceeds from issuance of long-term debt 255,967 55,000 45,000
Repayment of long-term debt (145,726) (61,816) (57,719)
Proceeds from issuance of common stock purchased under a long-term incentive plan 1,498 1,148 1,440
Payment of contingent earnout liability (1,200)    
Cash distribution to non-controlling interest holders (13,084)    
Repurchase of common stock (20,000) (4,999) (4,999)
Dividends paid (12,343) (11,326) (11,384)
Other (1,173) (953) (793)
Net cash provided by (used in) financing activities 63,939 (22,946) (28,455)
Effect of exchange rate changes on cash and cash equivalents (924)    
Net change in cash and cash equivalents (19,322) 34,562 (25,299)
Cash and cash equivalents at beginning of the period 170,385 135,823 161,122
Cash and cash equivalents at end of the period 151,063 170,385 135,823
Cash paid:      
Interest 16,105 7,965 8,819
Income taxes, net of refunds received 14,246 25,984 8,624
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES      
Obligations incurred for the acquisition of property   4,163  
Dividends declared and not yet paid $ 3,043 $ 3,087 $ 2,839