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Fair Value Measurements (Changes in Fair Value of Level 3 Assets and Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Investment available for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1, 2015	$ 17,839	$ 18,357
Total gains (losses) (realized or unrealized):
Included in earnings	130	125
Included in other comprehensive income (loss)	(299)	(263)
Purchases, sales, issuances and settlements:
Settlements	(411)
Balance at December 31, 2016	17,259	17,839
Purchases, sales, issuances and settlements:
Settlements		380
Earnout on Excess of EBITDA in 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1, 2016	0	(75)
Total gains (losses) (realized or unrealized):
Included in earnings		75
Included in other comprehensive income (loss)		0
Purchases, sales, issuances and settlements:
Settlements		0
Balance at December 31, 2016		0
Contingent Payments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1, 2016	(3,632)	(3,792)
Total gains (losses) (realized or unrealized):
Included in earnings	(600)	(627)
Included in other comprehensive income (loss)	0	0
Purchases, sales, issuances and settlements:
Settlements	(848)	(883)
Balance at December 31, 2016	$ (3,038)	$ (3,632)
Non-operating income | Investment available for sale
Total gains (losses) (realized or unrealized):
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings, Description	0	0
Non-operating income | Earnout on Excess of EBITDA in 2015
Total gains (losses) (realized or unrealized):
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings, Description		0
Non-operating income | Contingent Payments
Total gains (losses) (realized or unrealized):
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings, Description	346	-96

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) [Abstract]

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) [Abstract]

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Section 50
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Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Description of where the gains or losses, arising from liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), are included in earnings or the statement of financial position.

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