Description of Business and Summary of Significant Accounting Policies (Fair Value Reporting) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Total assets measured at fair value	[1]	$ 1,538	$ 281
Total liabilities measured at fair value	[1]	4,277	5,367
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation:
Beginning balance		5,367	14,420
(Gains) or losses included in earnings	[2]	(1,533)	(10,237)
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in earnings, unrealized still held at year end		(1,533)	(8,911)
Fair Value Net Derivative Asset (Liability) Measured On Recurring Basis, Unobservable Inputs Reconciliation, Purchase Accounting Adjustments Included in Goodwill		(2,000)	0
Foreign currency translation adjustments	[3]	(73)	(314)
Business acquisitions		2,516	4,312
Settlements		0	(2,814)
Ending balance		$ 4,277	5,367
Fair Value Inputs, Discount Rate		1.75%
Contingent Accrued Earn-out Acquisition Consideration
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative liabilities	[1],[4]	$ 4,277	5,367
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation:
Beginning balance		5,400
Ending balance		4,300	5,400
Certificates of Deposit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale securities	[1]	1,538	281
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Total assets measured at fair value	[1]	1,538	281
Fair Value, Inputs, Level 1 | Certificates of Deposit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale securities	[1]	1,538	281
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Total liabilities measured at fair value	[1]	0	0
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Total liabilities measured at fair value	[1]	4,277	5,367
Fair Value, Inputs, Level 3 | Contingent Accrued Earn-out Acquisition Consideration
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative liabilities	[1],[4]	$ 4,277	$ 5,367

[1] During the year ended December 31, 2015 and 2014, respectively, there were no transfers between fair value levels 1, 2, or 3.

[2] Recorded as an adjustment to reported general and administrative expenses

[3] Recorded as a component of other comprehensive income within stockholders' equity

[4] The income valuation approach is applied and the valuation inputs include the contingent payment arrangement terms, projected cash flows, rate of return, and probability assessments.