Goodwill and Intangible Assets (Schedule of Finite-Lived Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Total intangible assets
Cost	$ 311,456	$ 311,456
Accumulated Amortization	(95,060)	(84,649)
Accumulated Impairment Charge	(113,067)	(113,067)
Carrying value	103,329	113,740
Trade Names (Amortizable) [Member]
Finite-Lived intangible assets
Cost	74,350	74,350
Accumulated amortization	(8,207)	(6,341)
Accumulated impairment charge	(23,232)	(23,232)
Carrying value	42,911	44,777
Weighted average amortization period	20 years	20 years
Customer relationships [Member]
Finite-Lived intangible assets
Cost	39,800	39,800
Accumulated amortization	(15,278)	(14,315)
Accumulated impairment charge	(16,645)	(16,645)
Carrying value	7,877	8,840
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	(71,575)	(63,993)
Carrying value	$ 2,131	$ 9,713
Weighted average amortization period	3 years 7 months 6 days	3 years 7 months 6 days