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Goodwill and Other Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Change in goodwill |
| 2017 |  | 2016
Goodwill, balance at January 1, | $ | 785,399 |  |  | $ | 757,142 |
Change in goodwill | 3,659 |  |  | 28,257 |
Goodwill, balance at December 31, | $ | 789,058 |  |  | $ | 785,399 |
Amortizable intangibles |
| Cost of Amortizable Intangibles |  | Accumulated Amortization (Expense) Benefit |  | Net Amortizable Intangibles
| December 31, 2017 |  | December 31, 2016 |  | December 31, 2017 |  | December 31, 2016 |  | December 31, 2017 |  | December 31, 2016
Amortizable intangible assets: |  |  |  |  |  |  |  |  |  |  |
Favorable leases | $ | 22,500 |  |  | $ | 27,960 |  |  | $ | (14,495 | ) |  | $ | (18,104 | ) |  | $ | 8,005 |  |  | $ | 9,856 |
Non-compete agreements | 1,851 |  |  | 1,887 |  |  | (464 | ) |  | (414 | ) |  | 1,387 |  |  | 1,473 |
Total amortizable intangible assets | $ | 24,351 |  |  | $ | 29,847 |  |  | $ | (14,959 | ) |  | $ | (18,518 | ) |  | $ | 9,392 |  |  | $ | 11,329 |
Unfavorable leases | $ | 14,470 |  |  | $ | 19,950 |  |  | $ | 11,853 |  |  | $ | 15,840 |  |  | $ | 2,617 |  |  | $ | 4,110 |
Estimated net amortization of intangibles |
| December 31, 2017
| Amortization Expense |  | Amortization Benefit |  | Total Amortization Expense
2018 | $ | (1,622 | ) |  | $ | 923 |  |  | $ | (699 | )
2019 | (1,405 | ) |  | 713 |  |  | (692 | )
2020 | (1,228 | ) |  | 541 |  |  | (687 | )
2021 | (1,001 | ) |  | 389 |  |  | (612 | )
2022 | (883 | ) |  | 51 |  |  | (832 | )
Total | $ | (6,139 | ) |  | $ | 2,617 |  |  | $ | (3,522 | )

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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