CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 11,857	$ 25,933	$ 22,387
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation		19,912	13,557
Amortization of intangible assets	1,447	3,685	3,193
Gain on sale of property and equipment		(202)	(1,776)
Income from non-consolidated entities	47	(56)	(1,054)
Non-consolidated entity distributions		145	1,260
Stock-based compensation expense		91
Changes in assets and liabilities:
Customer retention deposits and restricted cash		7,874	(8,678)
Accounts receivable		17,003	20,813
Costs and estimated earnings in excess of billings		(28,587)	(2,983)
Other current assets		(3,221)	206
Accounts payable		(50,407)	(2,056)
Billings in excess of costs and estimated earnings		3,678	(6,455)
Contingent earnout liabilities		(10,161)	(2,871)
Accrued expenses and other current liabilities		4,254	6,397
Other long-term liabilities		(1,585)	(2,237)
Net cash provided by (used in) operating activities		(11,644)	39,703
Cash flows from investing activities:
Purchase of property and equipment		(49,256)	(12,409)
Proceeds from sale of property and equipment		1,675	6,731
Purchase of short-term investments		(4,175)
Sale of short-term investments		4,188	23,000
Cash paid for acquisitions		(1,025)	(35,131)
Net cash used in investing activities		(48,593)	(17,809)
Cash flows from financing activities:
Proceeds from issuance of long-term debt		42,364	12,776
Repayment of capital leases		(2,145)	(7,075)
Repayment of long-term debt		(23,664)	(8,284)
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		(1,547)	(3,069)
Repurchase of common stock			(1,001)
Net cash provided by (used in) financing activities		16,463	(22,914)
Net change in cash and cash equivalents		(43,774)	(1,020)
Cash and cash equivalents at beginning of the period		157,551	120,306
Cash and cash equivalents at end of the period	119,286	113,777	119,286
Cash paid during the period for:
Interest		2,559	1,588
Income taxes, net of refunds received		18,016	11,081
Components of cash paid for acquisitions:
Fair value of assets acquired - FSSI		2,377
Fair value of assets acquired - Sprint	28,377		28,377
Fair value of assets acquired - Silva	14,109		14,109
Cash payment to sellers after closing	(175)	(650)	(175)
Contingent liabilities	(6,200)	(702)	(6,200)
Common stock issued for acquisition	(980)		(980)
Cash paid for acquisitions	35,131	1,025	35,131
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES
Obligations incurred for the acquisition of property and equipment		2,500	1,046
Dividends declared and not yet paid	$ 1,542	$ 1,805	$ 1,542