Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Three months ended Three months ended June 30, 2017 June 30, 2016 Before Tax Income Tax Net Before Tax Income Tax Net Accumulated unrealized (loss) gains, net, on investments available for sale, beginning of period $ (1,881 ) $ (636 ) $ (1,245 ) $ 186,253 $ 63,330 $ 122,923 Other comprehensive income before reclassification 62,602 21,285 41,317 123,438 41,969 81,469 Reclassification adjustment for realized investment gains, net, included in realized gains on investments, net (7,507 ) (2,552 ) (4,955 ) (914 ) (311 ) (603 ) Effect on other comprehensive income 55,095 18,733 36,362 122,524 41,658 80,866 Accumulated unrealized income, net, on investments available for sale, end of period $ 53,214 $ 18,097 $ 35,117 $ 308,777 $ 104,988 $ 203,789 Accumulated unrealized losses, net, on interest rate swap, beginning of period $ (1,126 ) $ (384 ) $ (742 ) $ (51,047 ) $ (17,357 ) $ (33,690 ) Other comprehensive loss before reclassification (4,204 ) (1,428 ) (2,776 ) (13,478 ) (4,582 ) (8,896 ) Effect on other comprehensive losses (4,204 ) (1,428 ) (2,776 ) (13,478 ) (4,582 ) (8,896 ) Accumulated unrealized losses, net, on interest rate swap, end of period $ (5,330 ) $ (1,812 ) $ (3,518 ) $ (64,525 ) $ (21,939 ) $ (42,586 ) Accumulated other comprehensive (loss) gain, beginning of period $ (3,007 ) $ (1,020 ) $ (1,987 ) $ 135,206 $ 45,973 $ 89,233 Change in unrealized gains, net, on investments available for sale 55,095 18,733 36,362 122,524 41,658 80,866 Change in unrealized losses, net, on interest rate swap (4,204 ) (1,428 ) (2,776 ) (13,478 ) (4,582 ) (8,896 ) Effect on other comprehensive income 50,891 17,305 33,586 109,046 37,076 71,970 Accumulated other comprehensive income, end of period $ 47,884 $ 16,285 $ 31,599 $ 244,252 $ 83,049 $ 161,203 Six months ended Six months ended June 30, 2017 June 30, 2016 Before Tax Income Tax Net Before Tax Income Tax Net Accumulated unrealized loss, net, on investments available for sale, beginning of period $ (13,376 ) $ (4,544 ) $ (8,832 ) $ (34,498 ) $ (11,726 ) $ (22,772 ) Other comprehensive income before reclassification 103,312 35,126 68,186 291,950 99,263 192,687 Reclassification adjustment for realized investment (gains) losses, net, included in realized gains on investments, net (36,722 ) (12,485 ) (24,237 ) 51,325 17,451 33,874 Effect on other comprehensive income 66,590 22,641 43,949 343,275 116,714 226,561 Accumulated unrealized gains, net, on investments available for sale, end of period $ 53,214 $ 18,097 $ 35,117 $ 308,777 $ 104,988 $ 203,789 Accumulated unrealized losses, net, on interest rate swap, beginning of period $ (6,697 ) $ (2,277 ) $ (4,420 ) $ (18,016 ) $ (6,126 ) $ (11,890 ) Other comprehensive income (loss) before reclassification 1,367 465 902 (46,509 ) (15,813 ) (30,696 ) Effect on other comprehensive income (loss) 1,367 465 902 (46,509 ) (15,813 ) (30,696 ) Accumulated unrealized losses, net, on interest rate swap, end of period $ (5,330 ) $ (1,812 ) $ (3,518 ) $ (64,525 ) $ (21,939 ) $ (42,586 ) Accumulated other comprehensive loss, beginning of period $ (20,073 ) $ (6,821 ) $ (13,252 ) $ (52,514 ) $ (17,852 ) $ (34,662 ) Change in unrealized gains, net, on investments available for sale 66,590 22,641 43,949 343,275 116,714 226,561 Change in unrealized gains (losses), net, on interest rate swap 1,367 465 902 (46,509 ) (15,813 ) (30,696 ) Effect on other comprehensive income 67,957 23,106 44,851 296,766 100,901 195,865 Accumulated other comprehensive income, end of period $ 47,884 $ 16,285 $ 31,599 $ 244,252 $ 83,049 $ 161,203 |