Multiemployer Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Multiemployer Plans [Line Items]
Multiemployer Plans Period Contributions Significance Of Contributions	false
Multiemployer Pension Plans [Member]
Multiemployer Plans [Line Items]
Multiemployer Plan, Period Contributions	$ 144	$ 138	$ 196
Multiemployer plan period contributions from discontinuing operations			61
Multiemployer Health Plans [Member]
Multiemployer Plans [Line Items]
Multiemployer Plan, Period Contributions	533	499	734
Multiemployer plan period contributions from discontinuing operations			$ 250