Goodwill and Intangible Assets (Schedule of Finite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived intangible assets
Carrying Value	$ 47,000
Total intangible assets
Cost	311,456	$ 311,456
Accumulated Amortization	(100,964)	(98,135)
Accumulated Impairment Charge	(113,067)	(113,067)
Carrying Value	97,425	100,254
Trade Names [Member]
Finite-Lived intangible assets
Cost	74,350	74,350
Accumulated Amortization	(10,695)	(8,829)
Accumulated Impairment Charge	(23,232)	(23,232)
Carrying Value	$ 40,423	$ 42,289
Weighted Average Amortization Period	20 years	20 years
Customer Relationships [Member]
Finite-Lived intangible assets
Cost	$ 39,800	$ 39,800
Accumulated Amortization	(16,563)	(15,600)
Accumulated Impairment Charge	(16,645)	(16,645)
Carrying Value	$ 6,592	$ 7,555
Weighted Average Amortization Period	11 years 4 months 24 days	11 years 4 months 24 days
Construction Contract Backlog [Member]
Finite-Lived intangible assets
Cost	$ 73,706	$ 73,706
Accumulated Amortization	$ (73,706)	$ (73,706)
Weighted Average Amortization Period		3 years 7 months 6 days