Financial Instruments (Details) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Disclosure About Significant Unobservable Inputs
Investments	$ 18,889,000	$ 20,478,000
Level 1
Disclosure About Significant Unobservable Inputs
Cash equivalents	3,800,000	3,100,000
Remaining financial instruments owned related to legacy deferred compensation plans	700,000
Investments \| Level 3
Disclosure About Significant Unobservable Inputs
Investments	18,900,000	20,478,000
Investments \| Level 3 \| Market comparable companies \| Minimum
Disclosure About Significant Unobservable Inputs
Enterprise value/Revenue multiple	2.7	4.3
Discount rate (as a percent)	30.00%	25.00%
Investments \| Level 3 \| Market comparable companies \| Maximum
Disclosure About Significant Unobservable Inputs
Enterprise value/Revenue multiple	7.0	6.7
Discount rate (as a percent)	35.00%	40.00%
Investments \| Level 3 \| Market comparable companies \| Weighted average
Disclosure About Significant Unobservable Inputs
Enterprise value/Revenue multiple	5.5	5.7
Discount rate (as a percent)	30.00%	22.00%
Investments \| Level 3 \| Venture capital method \| Weighted average
Disclosure About Significant Unobservable Inputs
Enterprise value/EBITDA multiple	5.0
Discount rate (as a percent)	55.00%
Investment in FATV
Disclosure About Significant Unobservable Inputs
Investments	17,624,000	17,110,000
Investment in FATV \| Level 3
Disclosure About Significant Unobservable Inputs
Investments	$ 17,600,000	$ 17,100,000
Number of privately held companies	6	7

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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