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Fair Value Measurements (Change in Fair Value of Securities Using Level 3 Inputs) (Details) - Available-for-sale Securities [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, December 31, 2018	$ 0
Total net (losses) gains for the period included in OCI	0
Total net (losses) gains for the period included in net income	0
Purchases	0
Sales	0
Issuances	0
Settlements	0
Transfers into Level 3	16,419
Transfers out of Level 3	0
Fair value, March 31, 2019	16,419
Collateralized Loan Obligations and Other Asset Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, December 31, 2018	7,409
Total net (losses) gains for the period included in OCI	(225)
Total net (losses) gains for the period included in net income	0
Purchases	12,434
Sales	0
Issuances	0
Settlements	0
Transfers into Level 3	11,674
Transfers out of Level 3	0
Fair value, March 31, 2019	31,292
Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, December 31, 2018	7,409
Total net (losses) gains for the period included in OCI	(225)
Total net (losses) gains for the period included in net income	0
Purchases	12,434
Sales	0
Issuances	0
Settlements	0
Transfers into Level 3	28,093
Transfers out of Level 3	0
Fair value, March 31, 2019	$ 47,711

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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