Fair Value Measurements - Level 3 Rollforward (Details) (Fair Value, Inputs, Level 3 [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 8,898
Interest Accretion	608
Ending Balance	9,506
Summit earnout
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	5,444
Interest Accretion	395
Ending Balance	5,839
Techniquimia holdback
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,877
Interest Accretion	123
Ending Balance	2,000
Non-competition agreement obligation
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	675
Interest Accretion	25
Ending Balance	700
G.W. Smith holdback
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	902
Interest Accretion	65
Ending Balance	$ 967