CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 10,040	$ 10,530
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	9,490	6,424
Amortization of intangible assets	1,794	1,746
Loss (gain) on sale of property and equipment	48	(339)
Income from non-consolidated entities	(269)	(1,101)
Distributions received from non-consolidated entities		1,260
Changes in assets and liabilities:
Customer retention deposits and restricted cash	8,006	(3,886)
Accounts receivable	18,174	38,297
Costs and estimated earnings in excess of billings	(6,463)	9,494
Inventory, prepaid expenses and other current assets	(232)	3,946
Other long-term assets	(381)
Accounts payable	(46,557)	(20,141)
Billings in excess of costs and estimated earnings	2,052	(6,609)
Contingent earnout liabilities	356	208
Accrued expenses and other current liabilities	(99)	8
Other long-term liabilities	(3,240)	(12)
Net cash (used in) provided by operating activities	(7,281)	39,825
Cash flows from investing activities:
Purchase of property and equipment	(19,550)	(5,188)
Proceeds from sale of property and equipment	1,222	3,935
Purchase of short-term investments	(2,939)
Sale of short-term investments	3,201	23,000
Cash paid for acquisitions	(1,025)	(19,228)
Net cash (used in) provided by investing activities	(19,091)	2,519
Cash flows from financing activities:
Proceeds from issuance of long-term debt	16,116
Repayment of capital leases	(1,002)	(6,058)
Repayment of long-term debt	(6,221)	(4,959)
Repayment of subordinated debt		(16,861)
Proceeds from issuance of common stock purchased by management under long-term incentive plan	1,455	1,240
Dividends paid		(1,532)
Net cash provided by (used in) financing activities	10,348	(28,170)
Net change in cash and cash equivalents	(16,024)	14,174
Cash and cash equivalents at beginning of the period	157,551	120,306
Cash and cash equivalents at end of the period	141,527	134,480
Cash paid during the period for:
Interest	1,259	951
Income taxes, net of refunds received	802	955
Components of cash paid for acquisition:
Fair value of assets acquired	2,513	28,524
Estimated cash payments due sellers	(650)	(2,116)
Contingent liabilities	(838)	(6,200)
Common stock issued for acquisition		(980)
Cash paid for acquisition	1,025	19,228
Non-cash activities:
Dividends declared and not yet paid	$ 1,547	$ 1,537