Supplemental Information (Details 5) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2010	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Supplemental Information
Losses (gains) on sales, disposals and involuntary conversions of long-lived assets		$ 1,977	$ 5,962	$ 5,436	$ 4,180
Provision for retirement of assets			46,264		46,264
Intangible asset impairment			74,960		74,960
Goodwill impairment			26,279		26,279
Termination of employment contract				45,000
Litigation expenses		(502)	4,996	5,659	5,536
Foreign currency transaction losses (gains)		2,990	2,710	7,307	2,255
Losses (gains) on derivative instruments			(551)		(1,013)
Other losses (gains)		4,847	297	5,717	616
Losses (gains) on sales and retirements of long-lived assets and other expense (income), net		9,312	160,917	69,119	159,077
Superior trade name, useful life	10 years
Accumulated other comprehensive income (loss)
Balance at the beginning of the period				431,595	321,264
Other comprehensive income (loss) before reclassifications				(47,656)	4,822
Amount reclassified from accumulated other comprehensive income (loss)				(84,923)	(7,998)
Other comprehensive income (loss), net of tax		(44,127)	(24,375)	(132,579)	(3,176)
Balance at the end of the period		299,016	318,088	299,016	318,088
Gains (losses) on cash flow hedges
Accumulated other comprehensive income (loss)
Balance at the beginning of the period				(2,793)	(3,254)
Amount reclassified from accumulated other comprehensive income (loss)				187	263
Other comprehensive income (loss), net of tax				187	263
Balance at the end of the period		(2,606)	(2,991)	(2,606)	(2,991)
Unrealized gains (losses) on available-for-sale securities
Accumulated other comprehensive income (loss)
Balance at the beginning of the period				134,229	45,179
Other comprehensive income (loss) before reclassifications				4,913	7,215
Amount reclassified from accumulated other comprehensive income (loss)				(85,454)	(8,579)
Other comprehensive income (loss), net of tax				(80,541)	(1,364)
Balance at the end of the period		53,688	43,815	53,688	43,815
Defined benefit pension plan items
Accumulated other comprehensive income (loss)
Balance at the beginning of the period				(7,632)	(7,378)
Amount reclassified from accumulated other comprehensive income (loss)				344	318
Other comprehensive income (loss), net of tax				344	318
Balance at the end of the period		(7,288)	(7,060)	(7,288)	(7,060)
Foreign currency items
Accumulated other comprehensive income (loss)
Balance at the beginning of the period				307,791	286,717
Other comprehensive income (loss) before reclassifications				(52,569)	(2,393)
Other comprehensive income (loss), net of tax				(52,569)	(2,393)
Balance at the end of the period		$ 255,222	$ 284,324	$ 255,222	$ 284,324