Fair Value Measurements (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2016		Dec. 31, 2015
Liabilities:
Maximum contingent consideration liability		$ 1,742
Debt instrument, variable interest rate duration between resets		90 days
Buckley Scott
Liabilities:
Maximum contingent consideration liability		$ 1,742		$ 2,027
Cash and cash equivalents | Measured on a recurring basis
Assets:
Money market funds	[1]	10,042
Cash and cash equivalents | Level 1 | Measured on a recurring basis
Assets:
Money market funds	[1]	10,042
Other noncurrent liabilities | Measured on a recurring basis
Liabilities:
Contingent earnout liability	[2]	1,742
Other noncurrent liabilities | Level 3 | Measured on a recurring basis
Liabilities:
Contingent earnout liability		$ 1,742	[2]	$ 1,921

[1] The fair values of the money market funds were based on recently quoted market prices and reported transactions in an active marketplace. Money market funds are included in the Company's unaudited Condensed Consolidated Balance Sheets as "Cash and cash equivalents."

[2] The fair value of the contingent earnout liability for the 2014 acquisition of Buckley Scott Holdings Limited ("Buckley Scott") was estimated using an internally-prepared probability-weighted discounted cash flow analysis. The fair value analysis relied upon both Level 2 data (publicly observable data such as market interest rates and capital structures of peer companies) and Level 3 data (internal data such as the Company's operating projections). As such, the liability is a Level 3 fair value measurement. The valuation is sensitive to Level 3 data, with a maximum possible earnout of $1,742,000 at September 30, 2016, the same as the fair value recorded. The fair value of the contingent earnout liability is included in "Other accrued liabilities" on the Company's unaudited Condensed Consolidated Balance Sheets, based upon the term of the contingent earnout agreement. The fair value of the earnout was $1,921,000, with a maximum possible earnout of $2,027,000, at December 31, 2015. The change in the Level 3 fair value at September 30, 2016 was due to foreign currency translation adjustments and imputed interest.