Goodwill and Intangible Assets (Details 3) (USD $)	3 Months Ended	6 Months Ended		6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Trade Names (Amortizable)	Dec. 31, 2013 Trade Names (Amortizable)	Jun. 30, 2014 Customer relationships	Dec. 31, 2013 Customer relationships	Jun. 30, 2014 Construction contract backlog	Dec. 31, 2013 Construction contract backlog
Finite-Lived intangible assets
Cost				$ 74,350,000	$ 74,350,000	$ 39,800,000	$ 39,800,000	$ 73,706,000	$ 73,706,000
Accumulated amortization				(7,585,000)	(6,341,000)	(14,957,000)	(14,315,000)	(69,444,000)	(63,993,000)
Accumulated impairment charge				(23,232,000)	(23,232,000)	(16,645,000)	(16,645,000)
Carrying value				43,533,000	44,777,000	8,198,000	8,840,000	4,262,000	9,713,000
Weighted average amortization period				20 years	20 years	11 years 4 months 24 days	11 years 4 months 24 days	3 years 7 months 6 days	3 years 7 months 6 days
Total intangible assets
Cost	311,456,000	311,456,000	311,456,000
Accumulated Amortization	(91,986,000)	(91,986,000)	(84,649,000)
Accumulated Impairment Charge	(113,067,000)	(113,067,000)	(113,067,000)
Carrying value	106,403,000	106,403,000	113,740,000
Amortization expense
Amortization expense	3,700,000	7,300,000
Remainder of 2014	6,100,000	6,100,000
Amortization expense, 2015	3,700,000	3,700,000
Amortization expense, 2016	3,500,000	3,500,000
Amortization expense, 2017	3,500,000	3,500,000
Amortization expense, 2018	3,500,000	3,500,000
Amortization expense, thereafter	$ 35,500,000	$ 35,500,000