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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income $ 74,680 $ 58,267 $ 58,559
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation 42,421 29,080 24,104
Amortization of intangible assets 7,467 6,543 9,699
Intangible asset impairment 808    
Stock-based compensation expense 367    
Loss (gain) on sale of property and equipment (1,406) (2,752) 335
(Income) loss from non-consolidated entities 4,836 (186) (4,018)
Impairment expense for non-consolidated entities 4,932    
Other than temporary basis difference for non-consolidated entities 3,975   (1,700)
Distributions received from non-consolidated entities 2,821 1,358 10,136
Net deferred tax liabilities (assets) (12,582) (879) 7,453
Changes in assets and liabilities:      
Customer retention deposits and restricted cash 30,073 (3,887) (18,972)
Accounts receivable (36,860) (52,092) 20,767
Costs and estimated earnings in excess of billings (15,445) 5,426 (24,591)
Other current assets (14,774) (1,341) (6,654)
Accounts payable (25,131) 34,338 17,241
Billings in excess of costs and estimated earnings 14,473 20,639 (67,539)
Contingent earnout liabilities (14,900) (1,435) 2,927
Accrued expenses and other current liabilities 15,824 3,176 3,318
Other long-term liabilities 1,107 2,138 6,735
Net cash provided by operating activities 77,753 98,393 39,500
Cash flows from investing activities:      
Purchase of property and equipment (87,050) (37,395) (29,052)
Proceeds from sale of property and equipment 7,865 9,035 3,443
Purchase of short-term investments (23,110) (6,869) (36,000)
Sale of short-term investments 7,448 26,428 39,000
Cash paid for acquisitions (2,273) (86,207)  
Net cash used in investing activities (97,120) (95,008) (22,609)
Cash flows from financing activities:      
Proceeds from issuance of long-term debt 107,609 94,471 44,000
Repayment of capital leases (4,618) (9,021) (6,282)
Repayment of long-term debt (35,896) (26,633) (22,329)
Repayment of subordinated debt   (17,501) (20,710)
Purchase of Unit Purchase Option     (2,030)
Proceeds from issuance of common stock purchased by management under long-term incentive plan 1,455 1,240 647
Cash distribution to non-controlling interest holder (5,500)    
Repurchase of common stock   (1,001)  
Dividends paid (5,157) (7,695) (5,318)
Net cash provided by (used in) financing activities 57,893 33,860 (12,022)
Net change in cash and cash equivalents 38,526 37,245 4,869
Cash and cash equivalents at beginning of year 157,551 120,306 115,437
Cash and cash equivalents at end of the year 196,077 157,551 120,306
Cash paid during the year for:      
Interest 5,532 3,004 4,765
Income taxes, net of refunds received 48,126 31,404 33,600
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES      
Obligations incurred for the acquisition of property and equipment 2,637 2,932 5,312
Dividends declared and not yet paid $ 1,805   $ 1,532