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Summary of Significant Accounting Policies (Summary of Changes in Accumulated Balances of Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Beginning Balance | $ 351 |
Other comprehensive loss before reclassifications adjustments for gains (losses) on available for sale investments, tax | (237) |
Amount of (loss) gain reclassified from accumulated other comprehensive loss, tax | (351) |
Net current period other comprehensive income (loss), tax | (588) |
Ending Balance | (237) |
Beginning Balance | (239,279) |
Other comprehensive loss before reclassifications adjustments for gains (losses) on available for sale investments, net of tax | (10,743) |
Amount of (loss) gain reclassified from accumulated other comprehensive loss, net of tax | 672 | $ 379
Net current period other comprehensive income (loss), net of tax | (10,071) |
Ending Balance | (249,350) |
Unrealized (Losses) Gains on Investments [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Beginning Balance | (1,023) |
Other comprehensive loss before reclassifications adjustments for gains (losses) on available for sale investments, before tax | 685 |
Amount of (loss) gain reclassified from accumulated other comprehensive loss, before tax | 1,023 |
Net current period other comprehensive income (loss), before tax | 1,708 |
Ending Balance | 685 |
Foreign Currency Translation [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Beginning Balance | (238,607) |
Other comprehensive loss before reclassifications adjustments for gains (losses) on available for sale investments, before tax | (11,191) |
Net current period other comprehensive income (loss), before tax | (11,191) |
Ending Balance | $ (249,798) |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: 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=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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