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Significant Accounting Policies, Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning balance |  |  |  | $ 365,280 |
Net current period other comprehensive income (loss) |  | $ 105 | $ 173 | (773) | $ 159
Ending balance |  | 840,144 |  | 840,144 |
Accumulated Other Comprehensive Loss [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning balance |  | (32,637) | (30,372) | (31,759) | (30,358)
Ending balance |  | (32,532) | (30,199) | (32,532) | (30,199)
Unrealized Gains (Losses) on Securities [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Other comprehensive income (loss) before reclassifications | [1] | 133 | 215 | (834) | 610
Amounts reclassified from accumulated other comprehensive loss |  | 0 | 0 | 0 | (374)
Other comprehensive income (loss), tax |  | 0 | 0 | 0 | 0
Currency Translation Adjustment [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Other comprehensive income (loss) before reclassifications |  | $ (28) | $ (42) | $ 61 | $ (77)
[1] | There was no income tax expense or benefit related to elements of other comprehensive income (loss) for the three and nine months ended September 30, 2018 and 2017.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 + Details
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