Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Costs and estimated earnings in excess of billings beyond one year	$ 353,200
Indefinite lived intangible assets impairment charge	0
Current deferred tax asset	26,306	$ 17,962
Current deferred tax liabilities	$ 24,900
Minimum [Member]
Estimated useful lives	3 years
Maximum [Member]
Estimated useful lives	40 years