Fair Value Measurements and Derivative Instruments Fair Value Measurements and Derivative Instruments Available For Sale Securities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 53,086
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	53,218
Available-for-sale Securities, Amortized Cost Basis	336,476	375,693
Available-for-sale Securities, Gross Unrealized Gains	9,696	10,216
Available-for-sale Securities, Gross Unrealized Losses	(927)	(3,221)
Available-for-sale Securities	345,245	382,688
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	40,122
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	41,610
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	76,310
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	79,377
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	166,958
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	171,040
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	336,476
Available-for-sale Securities, Debt Securities	345,245
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	14,402	44,611
Available-for-sale Securities, Gross Unrealized Gains	42	53
Available-for-sale Securities, Gross Unrealized Losses	0	0
Available-for-sale Securities	14,444	44,664
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	123,272	127,807
Available-for-sale Securities, Gross Unrealized Gains	3,707	3,972
Available-for-sale Securities, Gross Unrealized Losses	(135)	(56)
Available-for-sale Securities	126,844	131,723
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	40,772	41,095
Available-for-sale Securities, Gross Unrealized Gains	2,744	2,851
Available-for-sale Securities, Gross Unrealized Losses	(48)	(20)
Available-for-sale Securities	43,468	43,926
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	158,030	162,180
Available-for-sale Securities, Gross Unrealized Gains	3,203	3,340
Available-for-sale Securities, Gross Unrealized Losses	(744)	(3,145)
Available-for-sale Securities	$ 160,489	$ 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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

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-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13, 19

-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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