Fair Value Measurements (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2015	Dec. 31, 2014
Liabilities [Abstract]
Debt instrument, variable interest rate duration between resets		90 days
Buckley Scott
Liabilities [Abstract]
Maximum contingent consideration liability		$ 2,017
Cash and cash equivalents | Measured on a recurring basis
Assets [Abstract]
Money market funds	[1]	11
Cash and cash equivalents | Level 1 | Measured on a recurring basis
Assets [Abstract]
Money market funds	[1]	11
Other noncurrent assets | Measured on a recurring basis | Currency swap
Assets [Abstract]
Derivative instruments not designated as hedging instruments, cross currency basis swap	[2]	4,530
Other noncurrent assets | Level 2 | Measured on a recurring basis | Currency swap
Assets [Abstract]
Derivative instruments not designated as hedging instruments, cross currency basis swap	[2]	4,530
Other noncurrent liabilities | Measured on a recurring basis
Liabilities [Abstract]
Contingent earnout liability	[3]	1,170
Other noncurrent liabilities | Level 3 | Measured on a recurring basis
Liabilities [Abstract]
Contingent earnout liability	[3]	$ 1,170	$ 1,153

[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 cross currency basis swap was derived from a discounted cash flow analysis based on the terms of the swap and the forward curves for foreign currency rates and interest rates adjusted for the counterparty's credit risk. The fair value of the cross currency basis swap is included in "Other noncurrent assets" on the Company's unaudited Condensed Consolidated Balance Sheets, based upon the term of the cross currency basis swap.

[3] 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 $2,017,000. As such, the fair value is not expected to vary materially from the balance recorded. The fair value of the contingent earnout liability is included in "Other noncurrent 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 $1,153,000 at December 31, 2014. The change in the Level 3 fair value at June 30, 2015 was due to foreign currency translation adjustments and inputed interest.