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Business Combinations Business Acquisition Proforma Information (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Business Combinations [Abstract] | |||||||||||
| Revenues | $ 577,438 | $ 443,835 | $ 443,912 | $ 432,421 | $ 503,195 | $ 325,869 | $ 449,527 | $ 493,483 | $ 1,897,606 | $ 1,772,074 | $ 1,748,667 |
| Income (Loss), Including Portion Attributable to Noncontrolling Interest | 190,007 | 125,623 | 153,640 | 112,967 | 153,803 | 50,522 | 137,821 | 93,524 | 582,237 | 435,670 | 413,566 |
| Business Acquisition, Pro Forma Revenue | 1,924,316 | 1,812,635 | |||||||||
| Business Acquisition, Pro Forma Net Income (Loss) | $ 591,377 | $ 442,096 | |||||||||