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Employee Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
Employee Benefit Plans (Narrative) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Plan Assets
Expected contributions to the defined benefit pension plan in 2015	$ 2,300,000
Expense provision for 401 (k) plans	3,600,000	3,800,000	3,800,000
Hedge Funds [Member]
Pension Plan Assets
Investments in hedge funds which do not have readily determinable fair values	45,500,000	44,700,000
Employee Pension Plans [Member]
Pension Plan Assets
Target asset allocation (as a percent)	100.00%
Other comprehensive gain (loss)	(13,900,000)	18,700,000	1,700,000
Accumulated other comprehensive loss	(56,147,000)	(42,261,000)		59,300,000
Net amount recognized in Consolidated Balance Sheets	34,967,000	22,561,000
Amount to be amortized from other comprehensive loss into cost in 2014	5,800,000
Expected return on assets (as a percent)	6.75%	6.75%	7.00%
Equity Securities: Domestic [Member] \| Employee Pension Plans [Member]
Pension Plan Assets
Target asset allocation (as a percent)	65.00%
Equity Securities: International [Member] \| Employee Pension Plans [Member]
Pension Plan Assets
Target asset allocation (as a percent)	25.00%
Fixed Income Securities [Member] \| Employee Pension Plans [Member]
Pension Plan Assets
Target asset allocation (as a percent)	5.00%
Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Account [Member]
Pension Plan Assets
Multiemployer Plan, Period Contributions	11,800,000	13,400,000	12,900,000
Steamfitters Industry Pension Fund [Member]
Pension Plan Assets
Multiemployer Plan, Period Contributions	5,100,000	4,300,000	3,500,000
Excavators Union Local 731 Pension Fund [Member]
Pension Plan Assets
Multiemployer Plan, Period Contributions	5,300,000	3,200,000	3,300,000
Carpenters Pension Trust Fund for Northern California [Member]
Pension Plan Assets
Multiemployer Plan, Period Contributions	1,800,000	2,100,000	2,300,000
Other Multiemployer Pension Plans [Member]
Pension Plan Assets
Multiemployer Plan, Period Contributions	$ 35,500,000	$ 31,600,000	$ 29,900,000
Multiemployer Pension Plans \| Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Account [Member]
Pension Plan Assets
Multiemployer Plans, Funded Status	At least 80 percent
Multiemployer Pension Plans \| Steamfitters Industry Pension Fund [Member]
Pension Plan Assets
Multiemployer Plans, Funded Status	Between 65 and less than 80 percent
Multiemployer Pension Plans \| Excavators Union Local 731 Pension Fund [Member]
Pension Plan Assets
Multiemployer Plans, Funded Status	At least 80 percent
Multiemployer Pension Plans \| Carpenters Pension Trust Fund for Northern California [Member]
Pension Plan Assets
Multiemployer Plans, Funded Status	Less than 65 percent