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Segment Reporting (Revenue by Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Revenues from External Customers [Line Items] |  |  |  |
Revenues | $ 468,618 | $ 407,864 | $ 907,892 | $ 786,908
Domestic [Member] |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |
Revenues | 448,296 | 388,744 | 866,960 | 747,393
Foreign [Member] |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |
Revenues | $ 20,322 | $ 19,120 | $ 40,932 | $ 39,515

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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