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Commitments and Contingencies - Leases (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract] |  |  |
Operating lease, leased facilities, term low end of range | 5 years |  |
Operating lease, leased facilities, term high end of range | 10 years |  |
Operating lease, leased facilities, minimum number of renewal options | 1 year |  |
Operating lease, leased facilities, renewal option period | 5 years |  |
Operating lease, vehicles and office equipment, minimum lease life | 1 year |  |
Operating lease, vehicles and office equipment, maximum lease life | 7 years |  |
Operating lease rent expense | $ 365,762 | $ 350,403 | $ 321,337
Operating Lease Payment |  |  |
2019 | 323,454 |  |
2020 | 293,276 |  |
2021 | 267,379 |  |
2022 | 246,128 |  |
2023 | 221,808 |  |
Thereafter | 1,287,807 |  |
Operating Lease Payment, Total minimum lease payments | 2,639,852 |  |
Sublease Income |  |  |
2019 | (7,525) |  |
2020 | (7,200) |  |
2021 | (7,063) |  |
2022 | (6,694) |  |
2023 | (6,409) |  |
Thereafter | (6,279) |  |
Sublease Income, Total minimum lease payments | (41,170) |  |
Capital Leases |  |  |
2019 | 80,513 |  |
2020 | 71,335 |  |
2021 | 61,269 |  |
2022 | 52,832 |  |
2023 | 44,722 |  |
Thereafter | 377,750 |  |
Capital Leases, Total minimum lease payments | 688,421 |  |
Less amounts representing interest | (241,248) |  |
Present value of capital lease obligations | $ 447,173 |  |

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- Definition Represents the minimum number of renewal options for leased facilities. + References No definition available. + Details
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- Definition Amount of minimum sublease rentals to be received by the lessee after the fifth fiscal year following the latest fiscal year for operating leases. + References No definition available. + Details
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- Definition Amount of minimum sublease rentals to be received by the lessee in the fifth fiscal year following the latest fiscal year for operating leases. + References No definition available. + Details
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- Definition Amount of minimum sublease rentals to be received by the lessee in the fourth fiscal year following the latest fiscal year for operating leases. + References No definition available. + Details
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- Definition Amount of minimum sublease rentals to be received by the lessee in the next fiscal year following the latest fiscal year for operating leases. + References No definition available. + Details
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- Definition Amount of minimum sublease rentals to be received by the lessee in the third fiscal year following the latest fiscal year for operating leases. + References No definition available. + Details
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- Definition Amount of minimum sublease rentals to be received by the lessee in the second fiscal year following the latest fiscal year for operating leases. + References No definition available. + Details
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- Definition Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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