Fair Value Measurements and Derivative Instruments Fair Value Measurements and Derivative Instruments Available For Sale Securities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 342,567	$ 375,693
Gross unrealized gains	4,175	10,216
Gross unrealized losses	(4,677)	(3,221)
Estimated fair value	342,065	382,688
Amortized cost - Within 1 year	55,811
Estimated fair value - Within 1 year	55,853
Amortized cost - After 1 year through 5 years	61,774
Estimated fair value - After 1 year through 5 years	62,635
Amortized cost - After 5 years through 10 years	62,694
Estimated fair value - After 5 years through 10 years	62,301
Amortized cost - After 10 years	162,288
Estimated fair value - After 10 years	161,276
Amortized cost - Total	342,567
Estimated fair value - Total	342,065
Money market funds / commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	36,134	44,611
Gross unrealized gains	0	53
Gross unrealized losses	(13)	0
Estimated fair value	36,121	44,664
Debt securities - U.S. and foreign governments, agencies and municipalities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	116,146	127,807
Gross unrealized gains	1,405	3,972
Gross unrealized losses	(2,441)	(56)
Estimated fair value	115,110	131,723
Debt securities - corporate
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	31,084	41,095
Gross unrealized gains	915	2,851
Gross unrealized losses	(465)	(20)
Estimated fair value	31,534	43,926
Mortgage-backed / asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	159,203	162,180
Gross unrealized gains	1,855	3,340
Gross unrealized losses	(1,758)	(3,145)
Estimated fair value	$ 159,300	$ 162,375

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Name:	us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGain
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLosses1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration