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Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Schedule Of Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance |  |  | $ (10,536) |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance | (9,973) |  | (9,973) |
Condensed Consolidated Statements Of Comprehensive Income [Abstract] |  |  |  |
Net income | 23,726 | 19,314 | 43,670 | 38,492
Other comprehensive income (loss): |  |  |  |
Foreign currency translation adjustments | 1,254 | 715 | 245 | 228
Unrealized gain on investments, net of tax | 42 | 270 | 318 | 351
Other | (1) | 0 | 0 | 25
Comprehensive income | 25,021 | 20,299 | 44,233 | 39,096
Parent [Member] |  |  |  |
Schedule Of Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Other comprehensive income before reclassifications |  |  | 563 |
Amounts reclassified from accumulated other comprehensive income |  |  | 0 |
Foreign currency translation adjustments [Member] |  |  |  |
Schedule Of Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance |  |  | (8,681) |
Other comprehensive income before reclassifications |  |  | 245 |
Amounts reclassified from accumulated other comprehensive income |  |  | 0 |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance | (8,436) |  | (8,436) |
Unrealized loss on investments [Member] |  |  |  |
Schedule Of Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance |  |  | (1,851) |
Other comprehensive income before reclassifications |  |  | 318 |
Amounts reclassified from accumulated other comprehensive income |  |  | 0 |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance | (1,533) |  | (1,533) |
Other [Member] |  |  |  |
Schedule Of Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance |  |  | (4) |
Other comprehensive income before reclassifications |  |  | 0 |
Amounts reclassified from accumulated other comprehensive income |  |  | 0 |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance | $ (4) |  | $ (4) |

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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 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: 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=28358780&loc=d3e637-108580 Reference 3: 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=28358780&loc=d3e681-108580 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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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=16317811 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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