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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income $ 5,364 $ 27,268
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 28,512 23,941
Amortization of intangible assets 3,370 3,687
Gain on sale of property and equipment (24) (809)
Income from non-consolidated entities   (14)
Stock-based compensation expense 524 409
Changes in assets and liabilities:    
Customer retention deposits and restricted cash (904) 5,248
Accounts receivable 21,603 (6,366)
Costs and estimated earnings in excess of billings (40,581) (30,965)
Other current assets (6,726) (9,846)
Accounts payable 356 3,273
Billings in excess of costs and estimated earnings (21,318) (15,268)
Contingent earnout liabilities (4,910) (4,559)
Accrued expenses and other current liabilities 3,820 3,232
Other long-term assets (1,800)  
Other long-term liabilities (4,547) (2,068)
Net cash used in operating activities (17,261) (2,837)
Cash flows from investing activities:    
Purchase of property and equipment (35,674) (38,625)
Proceeds from sale of property and equipment 3,602 3,017
Purchase of short-term investments   (2,280)
Sale of short-term investments 30,992 18,686
Cash received for the sale of Alvah   1,189
Cash paid for acquisition (22,302) (6,354)
Net cash used in investing activities (23,382) (24,367)
Cash flows from financing activities:    
Proceeds from issuance of long-term debt 11,000 15,400
Repayment of capital leases (714) (1,967)
Repayment of long-term debt (20,635) (18,673)
Proceeds from issuance of common stock purchased under a long-term incentive plan 1,621 1,671
Dividends paid (4,124) (3,612)
Cash distribution to non-controlling interest holder   (1,515)
Net cash used in financing activities (12,852) (8,696)
Net change in cash and cash equivalents (53,495) (35,900)
Cash and cash equivalents at beginning of the period 139,465 196,077
Cash and cash equivalents at end of the period 85,970 160,177
Cash paid during the period for:    
Interest 3,588 2,554
Income taxes, net of refunds received 5,645 17,235
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES    
Dividends declared and not yet paid $ 2,841 $ 1,808