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Revenue from Contracts with Customers - Summary of Disaggregation of Revenues from Contracts (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Term Life Insurance Segment Revenues [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions and fees |  | $ 272,978 | $ 238,901 | $ 543,286 | $ 472,953
Term Life Insurance Segment Revenues [Member] | Total Segment Revenues from Contracts with Customers [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions and fees |  | 10,913 | 10,244 | 21,328 | 19,690
Term Life Insurance Segment Revenues [Member] | Total Segment Revenues from Contracts with Customers [Member] | Other, Net [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions and fees |  | 10,913 | 10,244 | 21,328 | 19,690
Term Life Insurance Segment Revenues [Member] | Revenues from Sources Other Than Contracts with Customers (Segregated Funds) [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions and fees |  | 262,065 | 228,657 | 521,958 | 453,263
Investment and Savings Products Segment Revenues [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions and fees |  | 162,841 | 143,774 | 324,883 | 284,180
Investment and Savings Products Segment Revenues [Member] | Total Segment Revenues from Contracts with Customers [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions and fees |  | 153,399 | 129,416 | 300,332 | 255,812
Investment and Savings Products Segment Revenues [Member] | Total Segment Revenues from Contracts with Customers [Member] | Other, Net [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions and fees |  | 2,424 | 2,376 | 4,760 | 4,575
Investment and Savings Products Segment Revenues [Member] | Total Segment Revenues from Contracts with Customers [Member] | Commissions and Fees [Member] | Sales-based Revenues [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions and fees |  | 64,307 | 60,692 | 128,768 | 121,209
Investment and Savings Products Segment Revenues [Member] | Total Segment Revenues from Contracts with Customers [Member] | Commissions and Fees [Member] | Asset-based Revenues [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions and fees |  | 66,230 | 53,066 | 125,771 | 103,529
Investment and Savings Products Segment Revenues [Member] | Total Segment Revenues from Contracts with Customers [Member] | Commissions and Fees [Member] | Account-based Revenues [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions and fees |  | 20,438 | 13,282 | 41,033 | 26,499
Investment and Savings Products Segment Revenues [Member] | Revenues from Sources Other Than Contracts with Customers (Segregated Funds) [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions and fees |  | 9,442 | 14,358 | 24,551 | 28,368
Corporate and Other Distributed Products Segment Revenues [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions and fees |  | 31,996 | 31,021 | 59,568 | 61,727
Corporate and Other Distributed Products Segment Revenues [Member] | Total Segment Revenues from Contracts with Customers [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions and fees |  | 8,976 | 8,449 | 17,243 | 15,803
Corporate and Other Distributed Products Segment Revenues [Member] | Total Segment Revenues from Contracts with Customers [Member] | Other, Net [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions and fees |  | 1,453 | 1,530 | 2,599 | 2,824
Corporate and Other Distributed Products Segment Revenues [Member] | Total Segment Revenues from Contracts with Customers [Member] | Commissions and Fees [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions and fees | [1] | 7,523 | 6,919 | 14,644 | 12,979
Corporate and Other Distributed Products Segment Revenues [Member] | Revenues from Sources Other Than Contracts with Customers (Segregated Funds) [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions and fees |  | $ 23,020 | $ 22,572 | $ 42,325 | $ 45,924
[1] | Commissions and fees for the three and six months ended June 30, 2018 include $1.3 million and $2.1 million, respectively, attributable to performance obligations satisfied in a previous reporting period and represent the collection of variable consideration in the transaction price that had been previously constrained.

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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