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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net income $ 27,268 $ 25,933
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 23,941 19,912
Amortization of intangible assets 3,687 3,685
Gain on sale of property and equipment (809) (202)
Income from non-consolidated entities (14) (56)
Non-consolidated entity distributions   145
Stock-based compensation expense 409 91
Changes in assets and liabilities:    
Customer retention deposits and restricted cash 5,248 7,874
Accounts receivable (6,366) 17,003
Costs and estimated earnings in excess of billings (30,965) (28,587)
Other current assets (9,846) (3,221)
Accounts payable 3,273 (50,407)
Billings in excess of costs and estimated earnings (15,268) 3,678
Contingent earnout liabilities (4,559) (10,161)
Accrued expenses and other current liabilities 3,232 4,254
Other long-term liabilities (2,068) (1,585)
Net cash used in operating activities (2,837) (11,644)
Cash flows from investing activities:    
Purchase of property and equipment (38,625) (49,256)
Proceeds from sale of property and equipment 3,017 1,675
Purchase of short-term investments (2,280) (4,175)
Sale of short-term investments 18,686 4,188
Cash received for the sale of Alvah 1,189  
Cash paid for acquisitions (6,354) (1,025)
Net cash used in investing activities (24,367) (48,593)
Cash flows from financing activities:    
Proceeds from issuance of long-term debt 15,400 42,364
Repayment of capital leases (1,967) (2,145)
Repayment of long-term debt (18,673) (23,664)
Proceeds from issuance of common stock purchased under a long-term incentive plan 1,671 1,455
Dividends paid (3,612) (1,547)
Cash distribution to non-controlling interest holder (1,515)  
Net cash provided by (used in) financing activities (8,696) 16,463
Net change in cash and cash equivalents (35,900) (43,774)
Cash and cash equivalents at beginning of the period 196,077 157,551
Cash and cash equivalents at end of the period 160,177 113,777
Cash paid during the period for:    
Interest 2,554 2,559
Income taxes, net of refunds received 17,235 18,016
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES    
Obligations incurred for the acquisition of property and equipment   2,500
Dividends declared and not yet paid $ 1,808 $ 1,805