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Changes In Accumulated Other Comprehensive Income (Loss) By Component (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 855,872 | $ 553,902 | $ 443,145
Ending balance | 920,964 | 855,872 | 553,902
Reclassification adjustment from AOCI | 8,800 | (7,237) | (85)
Unrealized gains (losses), available-for-sale securities |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance | (2,681) | (4,602) |
Other comprehensive income (loss) before reclassifications | 7,800 | (1,872) |
Amounts reclassified from accumulated other comprehensive income to net income | (5,368) | 3,793 |
Net current-period other comprehensive income | 2,432 | 1,921 |
Ending balance | (249) | (2,681) | (4,602)
Foreign currency items, available-for-sale securities |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance | 0 | (584) |
Other comprehensive income (loss) before reclassifications | 88 | (146) |
Amounts reclassified from accumulated other comprehensive income to net income | 0 | 730 |
Net current-period other comprehensive income | 88 | 584 |
Ending balance | 88 | 0 | (584)
Total unrealized gains (losses), available-for-sale securities |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance | (2,681) | (5,186) |
Other comprehensive income (loss) before reclassifications | 7,888 | (2,018) |
Amounts reclassified from accumulated other comprehensive income to net income | (5,368) | 4,523 |
Net current-period other comprehensive income | 2,520 | 2,505 |
Ending balance | (161) | (2,681) | (5,186)
Unrealized loss on cash flow hedge |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance | (2,211) | (2,798) |
Other comprehensive income (loss) before reclassifications | 406 | (629) |
Amounts reclassified from accumulated other comprehensive income to net income | 1,607 | 1,216 |
Net current-period other comprehensive income | 2,013 | 587 |
Ending balance | (198) | (2,211) | (2,798)
Accumulated other comprehensive income (loss) |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance | (4,892) | (7,984) | (122)
Other comprehensive income (loss) before reclassifications | 8,294 | (2,647) |
Amounts reclassified from accumulated other comprehensive income to net income | (3,761) | 5,739 |
Net current-period other comprehensive income | 4,533 | 3,092 |
Ending balance | (359) | (4,892) | $ (7,984)
Gain on Investments |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Reclassification adjustment from AOCI | 8,800 | 25 |
Reclassification adjustment from AOCI, net | $ 5,400 | 16 |
Impairment Loss on Investment Securities |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Reclassification adjustment from AOCI |  | 7,300 |
Reclassification adjustment from AOCI, net |  | $ 4,500 |

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 + Details
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