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Derivative Instruments (Current Period Cash Flow Hedges in AOCI (loss) before Taxes) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
AOCI Cash Flow Hedges [Roll Forward] |  |  |  |
Balance beginning | $ (30,598) | $ (4,020) | $ (31,591) | $ (4,578)
Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges | 8,735 | 4,798 | 8,948 | 5,574
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (2,038) |  | (1,258) |
Balance ending | (23,901) | 457 | (23,901) | 457
Interest Rate Swap [Member] |  |  |  |
AOCI Cash Flow Hedges [Roll Forward] |  |  |  |
Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges | 2,417 | 4,798 | (5,150) | 5,574
Investment Income [Member] |  |  |  |
AOCI Cash Flow Hedges [Roll Forward] |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (543) |  | (603) |
Investment Income [Member] | Forward Contracts [Member] |  |  |  |
AOCI Cash Flow Hedges [Roll Forward] |  |  |  |
Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges | 0 |  | 0 |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (312) |  | (312) |
Investment Income [Member] | Interest Rate Swap [Member] |  |  |  |
AOCI Cash Flow Hedges [Roll Forward] |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (231) | (321) | (291) | (539)
Investment Related Gains Losses [Member] | Forward Contracts [Member] |  |  |  |
AOCI Cash Flow Hedges [Roll Forward] |  |  |  |
Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges | 6,318 |  | 14,098 |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ (1,495) | $ 0 | $ (655) | $ 0

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624177-113959 + Details
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- Definition Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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