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Fair Value Measurements and Derivative Instruments (Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 355,226 | $ 357,339
Gross unrealized gains | 4,528 | 6,836
Gross unrealized losses | (3,835) | (2,133)
Estimated fair value | 355,919 | 362,042
Investment securities at a loss position for more than 12 months, aggregate unrealized holding losses | 2,000 | 1,000
Investment securities at a loss position for more than 12 months, estimated fair value | 36,000 | 42,000
Investment securities at a loss position for less than 12 months, unrealized holding losses | 2,000 | 1,000
Investment securities at a loss position for less than 12 months, estimated fair value | 146,000 | 88,000
U.S. and foreign governments, agencies and municipalities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 114,265 | 135,839
Gross unrealized gains | 1,804 | 2,905
Gross unrealized losses | (1,268) | (764)
Estimated fair value | 114,801 | 137,980
Corporate |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 63,140 | 66,170
Gross unrealized gains | 823 | 1,569
Gross unrealized losses | (1,079) | (291)
Estimated fair value | 62,884 | 67,448
Mortgage-backed / asset-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 177,821 | 155,330
Gross unrealized gains | 1,901 | 2,362
Gross unrealized losses | (1,488) | (1,078)
Estimated fair value | $ 178,234 | $ 156,614

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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