Fair Value Disclosures - Quantitative Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Summit Earnout Quantitative Disclosures [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs Discount Rate	14.50%
Fair Value Inputs Weighted Average Probabilities	As of March 31, 2013, the weighted average probabilities applied to the payout scenarios ranged from 20% to 50%, depending on the Company’s estimate of the likelihood of each payout scenario.
Fair Value Measurements Valuation Techniques	Discounted cash flow
Acquisition-related Consideration	$ 4,660
Noncompetition Agreement Obligation Quantitative Disclosures [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs Discount Rate	14.00%
Fair Value Measurements Valuation Techniques	Discounted cash flow
Acquisition-related Consideration	$ 350