Accounts Receivable, Accounts Payable and Accrued Liabilities (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts Receivable, Net [Abstract]
Trade accounts receivable, less estimated returns, doubtful accounts and allowances	$ 398,014	$ 379,355
Other accounts receivable	30,639	19,849
Accounts receivable, net	428,653	399,204
Returns, doubtful accounts and allowances	33,834	35,462	50,225
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Begining of Period	35,462	50,225	70,181
Additions - Charged to Costs and Expenses	57,245	70,693	73,195
Deductions	(58,873)	(85,456)	(93,151)
Balance at End of Period	33,834	35,462	50,225
Accounts payable and accrued liabilities	343,620	310,294
Accrued compensation and related benefits	162,079	176,102
Total accounts payable and accrued liabilities	505,699	486,396
Allowance for doubtful accounts and returns [Member]
Accounts Receivable, Net [Abstract]
Returns, doubtful accounts and allowances	33,834	33,612	48,199
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Begining of Period	33,612	48,199	67,007
Additions - Charged to Costs and Expenses	57,245	55,605	61,327
Deductions	(57,023)	(70,192)	(80,135)
Balance at End of Period	33,834	33,612	48,199
Allowance for advertising rate adjustments and discounts [Member]
Accounts Receivable, Net [Abstract]
Returns, doubtful accounts and allowances	0	1,850	2,026
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Begining of Period	1,850	2,026	3,174
Additions - Charged to Costs and Expenses	0	15,088	11,868
Deductions	(1,850)	(15,264)	(13,016)
Balance at End of Period	$ 0	$ 1,850	$ 2,026