Goodwill (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
Mar. 31, 2013	Mar. 31, 2013 Television	Dec. 31, 2012 Television	Dec. 31, 2012 Online	Mar. 31, 2013 Online	Mar. 31, 2013 SourceEcreative	Dec. 31, 2012 SourceEcreative
Changes in carrying value of goodwill by reporting unit
Balance at beginning of period	$ 720,021	$ 364,344			$ 353,679	$ 1,998	$ 1,998
Accumulated impairment losses	(350,884)	(131,291)			(219,593)
Balance at beginning of period	369,137	233,053			134,086	1,998	1,998
Foreign currency translation	382	382
Balance at end of period	719,639	363,962		353,679	353,679	1,998	1,998
Accumulated impairment losses	(350,884)	(131,291)		(219,593)	(219,593)
Balance at end of period	368,755	232,671		134,086	134,086	1,998	1,998
Goodwill impairment charges				$ 219,593
Excess percentage of fair value over carrying value			13.00%				977.00%

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details

- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

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+ Details