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Goodwill and Intangible Assets, Net (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill and Intangible Assets, Net (Additional Textual) [Abstract]
Reduction in gross carrying amount and accumulated amortization	$ 68,400,000
Goodwill and Intangible Assets, Net (Textual) [Abstract]
Amortization expense	6,110,000	7,523,000	14,609,000
Charge related to changes in the estimated amount of contingent purchase			4,000,000
Trade names and trademarks [Member]
Goodwill and Intangible Assets, Net (Additional Textual) [Abstract]
Reduction in gross carrying amount and accumulated amortization	2,800,000
Subscriber relationships [Member]
Goodwill and Intangible Assets, Net (Additional Textual) [Abstract]
Reduction in gross carrying amount and accumulated amortization	13,900,000
Technology and other [Member]
Goodwill and Intangible Assets, Net (Additional Textual) [Abstract]
Reduction in gross carrying amount and accumulated amortization	$ 51,700,000

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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