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Business Combinations Pro forma (Details) - Post [Member] [Domain] - Pro Forma [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Total operating revenues | $ 1,494,298 | $ 1,426,785
Net Income (Loss) Available to Shareholders | $ 296,084 | $ 330,886
Earnings Per Share, Diluted | $ 2.61 | $ 2.90

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