Business, Basis of Presentation and Significant Accounting Policies (Restatement of Previously Reported Condensed Unaudited Consolidated Financial Statements) (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ 1,066,629	$ 1,107,232	$ 2,069,896	$ 2,065,050
Income tax expense	1,444	20,761	(2,908)	28,250
Net income from continuing operations	$ (3,820)	$ 33,738	$ (10,208)	$ 46,002
Continuing operations, basic earnings per share (in dollars per share)	$ (0.05)	$ 0.43	$ (0.12)	$ 0.59
Continuing operations, diluted earnings per share (in dollars per share)	(0.05)	0.39	(0.12)	0.53
Total basic earnings per share (in dollars per share)	(0.05)	0.43	(0.12)	0.59
Total diluted earnings per share (in dollars per share)	$ (0.05)	$ 0.39	$ (0.12)	$ 0.53
Costs and earnings in excess of billings	$ 390,400		$ 390,400		$ 485,600
Other current liabilities	35,033		35,033		66,527
Billings in excess of costs and earnings	$ 121,854		$ 121,854		$ 155,674
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax expense		$ 1,000		$ (1,400)
Net income from continuing operations		$ 1,700		$ (2,300)
Continuing operations, basic earnings per share (in dollars per share)		$ 0.02		$ (0.03)
Continuing operations, diluted earnings per share (in dollars per share)		0.02		(0.03)
Total basic earnings per share (in dollars per share)		0.02		(0.03)
Total diluted earnings per share (in dollars per share)		$ 0.02		$ (0.03)
Billings in excess of costs and earnings		$ (800)		$ (800)
Current taxes receivable		1,400		1,400
Restatement Adjustment [Member] | Contracts Accounted for under Percentage-of-Completion [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		2,700		(3,500)
Costs and earnings in excess of billings		(4,400)		(4,400)
Restatement Adjustment [Member] | Contracts Accounted for under Percentage-of-Completion [Member] | Reclassification Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Costs and earnings in excess of billings		(4,100)		(4,100)
Other current liabilities		$ (4,100)		$ (4,100)