Fair Value Fair Value Measurements (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets acquired in business combinations	$ 5,936
Goodwill and other intangibles	3,352
Fair value of earnout liability	(271)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets acquired in business combinations	0
Goodwill and other intangibles	0
Fair value of earnout liability	0
Level II
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets acquired in business combinations	0
Goodwill and other intangibles	0
Fair value of earnout liability	0
Level III
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets acquired in business combinations	5,936
Goodwill and other intangibles	3,352
Fair value of earnout liability	$ (271)