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Fair Value - Fair Value Measurements (Details) (Nonrecurring, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
West Construction, Inc.
Level 1
Dec. 31, 2012
West Construction, Inc.
Level II
Dec. 31, 2012
West Construction, Inc.
Level III
Dec. 31, 2012
West Construction, Inc.
Estimate of fair value, fair value disclosure
Dec. 31, 2010
TWLD
Level 1
Dec. 31, 2010
TWLD
Level II
Dec. 31, 2010
TWLD
Level III
Dec. 31, 2010
TWLD
Estimate of fair value, fair value disclosure
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets acquired in business combinations $ 0 $ 0 $ 5,936 $ 5,936 $ 0 $ 0 $ 53,746 $ 54,153
Goodwill and other intangibles 0 0 3,352 3,352 0 0 20,072 20,072
Fair value of earnout liability     $ (271) $ (271)