Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.

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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Change in fair value of contingent consideration	$ 0	$ 138
Fair Value, Measurements, Recurring
Class of Stock [Line Items]
Contingent consideration liabilities	0	11,586	$ 0	$ 11,448
Change in fair value of contingent consideration	0	$ 138
Money Market Funds [Member] \| Fair Value, Measurements, Recurring
Class of Stock [Line Items]
Available-for-sale Securities	25,725		19,257
Money Market Funds [Member] \| Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Class of Stock [Line Items]
Available-for-sale Securities	25,725		19,257
Money Market Funds [Member] \| Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Class of Stock [Line Items]
Available-for-sale Securities	0		0
Money Market Funds [Member] \| Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
Class of Stock [Line Items]
Available-for-sale Securities	$ 0		$ 0