Fair Value Measurements and Derivative Instruments Available For Sale Securities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Amortized cost within 1 year	$ 86,867
Estimated fair value within 1 year	87,014
Amortized cost after 1 year through 5 years	56,732
Estimated fair value after 1 year through 5 years	58,117
Amortized cost after 5 years through 10 years	65,019
Estimated fair value after 5 years through 10 years	65,869
Amortized cost after 10 years	167,075
Estimated fair value after 10 years	171,688
Amortized cost total	375,693
Available-for-sale Securities, Amortized Cost Basis	375,693	282,344
Available-for-sale Securities, Gross Unrealized Gains	10,216	8,545
Available-for-sale Securities, Gross Unrealized Losses	(3,221)	(1,613)
Available-for-sale Securities	382,688	289,276
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	44,611	25,253
Available-for-sale Securities, Gross Unrealized Gains	53	43
Available-for-sale Securities, Gross Unrealized Losses	0	0
Available-for-sale Securities	44,664	25,296
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	127,807	93,995
Available-for-sale Securities, Gross Unrealized Gains	3,972	4,264
Available-for-sale Securities, Gross Unrealized Losses	(56)	(8)
Available-for-sale Securities	131,723	98,251
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	41,095	31,114
Available-for-sale Securities, Gross Unrealized Gains	2,851	935
Available-for-sale Securities, Gross Unrealized Losses	(20)	(582)
Available-for-sale Securities	43,926	31,467
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	162,180	131,982
Available-for-sale Securities, Gross Unrealized Gains	3,340	3,303
Available-for-sale Securities, Gross Unrealized Losses	(3,145)	(1,023)
Available-for-sale Securities	$ 162,375	$ 134,262

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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