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Parent Only Statements - Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |
Net income | $ 487,476 | $ 288,934 | $ 250,327
Adjustments to reconcile net income to net cash (used in) provided by operating activities: |  |  |
Reduction (income) on tax indemnification receivable | 92,815 | 31,888 | (12,283)
Amortization of unsecured debt upfront fees | 1,128 | 1,316 | 1,229
Decrease in tax indemnification receivable | 35,989 | 59,633 | 59,633
Increase in other assets | (69,777) | (72,646) | (47,442)
Decrease in income taxes payable, net | (79,693) | (19,687) | (20,647)
Increase in other liabilities | 15,204 | 1,304 | 15,395
Total adjustments | (590,217) | (460,093) | (449,350)
Total net cash used in operating activities | (102,741) | (171,159) | (199,023)
Cash flows from investing activities: |  |  |
Net cash (used in) provided by investing activities | (3,254,863) | (3,160,150) | (3,308,863)
Cash flows from financing activities: |  |  |
Unsecured debt issued | 0 | 197,000 | 0
Issuance costs for unsecured debt offering | 0 | (1,057) | 0
Redemption of Series A Preferred Stock | 0 | (165,000) | 0
Preferred stock dividends paid | (15,640) | (15,714) | (21,204)
Net cash (used in) provided by financing activities | 4,403,324 | 2,994,974 | 3,036,197
Cash and cash equivalents at beginning of year | 1,534,339 | 1,918,793 |
Cash and cash equivalents at end of year | 2,559,106 | 1,534,339 | 1,918,793
Parent Company |  |  |
Cash flows from operating activities: |  |  |
Net income | 487,476 | 288,934 | 250,327
Adjustments to reconcile net income to net cash (used in) provided by operating activities: |  |  |
Undistributed earnings of subsidiaries | (532,741) | (320,775) | (265,278)
Reduction (income) on tax indemnification receivable | 92,815 | 31,888 | (12,283)
Amortization of unsecured debt upfront fees | 809 | 596 | 0
Decrease in investment in subsidiaries, net | 9,495 | 1,158 | 63,222
Decrease in tax indemnification receivable | 35,989 | 59,633 | 59,633
Increase in due from subsidiaries, net | (11,277) | (5,687) | (10,438)
Increase in other assets | (18,040) | (24,627) | (8,972)
Decrease in income taxes payable, net | (123,083) | (87,983) | (54,175)
(Decrease) increase in payable due to entity that is a subsidiary of Navient | (1,089) | (593) | 553
Increase in other liabilities | 6,807 | 10,205 | 8,856
Total adjustments | (540,315) | (336,185) | (218,882)
Total net cash used in operating activities | (52,839) | (47,251) | 31,445
Cash flows from investing activities: |  |  |
Net cash (used in) provided by investing activities | 0 | 0 | 0
Cash flows from financing activities: |  |  |
Unsecured debt issued | 0 | 197,000 | 0
Issuance costs for unsecured debt offering | 0 | (1,057) | 0
Redemption of Series A Preferred Stock | 0 | (165,000) | 0
Preferred stock dividends paid | (15,640) | (15,714) | (21,204)
Net cash (used in) provided by financing activities | (15,640) | 15,229 | (21,204)
Net (decrease) increase in cash and cash equivalents | (68,479) | (32,022) | 10,241
Cash and cash equivalents at beginning of year | 260,255 | 292,277 | 282,036
Cash and cash equivalents at end of year | $ 191,776 | $ 260,255 | $ 292,277

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