CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 49,126	$ 40,335
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	31,003	20,719
Amortization of intangible assets	5,576	4,669
Gain on sale of property and equipment	(1,176)	(2,396)
Income from non-consolidated entities	(169)	(895)
Impairment expense for non-consolidated entities	3,250
Non-consolidated entity distributions	3,186	1,260
Stock-based compensation expense	229
Changes in assets and liabilities:
Customer retention deposits and restricted cash	20,000	(3,324)
Accounts receivable	(16,402)	(64,933)
Costs and estimated earnings in excess of billings	(38,733)	(21,089)
Other current assets	(8,665)	475
Accounts payable	(32,551)	20,433
Billings in excess of costs and estimated earnings	(11,428)	7,329
Contingent earnout liabilities	(9,287)	(2,489)
Accrued expenses and other current liabilities	26,626	20,688
Other long-term liabilities	90	(1,510)
Net cash provided by operating activities	20,675	19,272
Cash flows from investing activities:
Purchase of property and equipment	(68,749)	(23,720)
Proceeds from sale of property and equipment	6,554	7,683
Purchase of short-term investments	(5,620)	(6,380)
Sale of short-term investments	5,882	23,000
Cash paid for acquisitions	(2,273)	(38,110)
Net cash used in investing activities	(64,206)	(37,527)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	97,035	16,671
Repayment of capital leases	(3,399)	(8,018)
Repayment of long-term debt	(29,225)	(12,177)
Repayment of subordinated debt		(17,501)
Proceeds from issuance of common stock purchased by management under long-term incentive plan	1,455	1,240
Dividends paid	(3,352)	(4,611)
Payment of accumulated earnings to non-controlling interest holder	(2,500)
Repurchase of common stock		(1,001)
Net cash provided by (used in) financing activities	60,014	(25,397)
Net change in cash and cash equivalents	16,483	(43,652)
Cash and cash equivalents at beginning of the period	157,551	120,306
Cash and cash equivalents at end of the period	174,034	76,654
Cash paid during the period for:
Interest	3,369	2,282
Income taxes, net of refunds received	32,379	18,082
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES
Obligations incurred for the acquisition of property and equipment	2,523	1,854
Dividends declared and not yet paid	$ 1,805	$ 1,542