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Acquisitions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross $ 89,683 $ 64,521 $ 119,965
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 92 6 (18)
Land      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross 9,732 1,054 12,811
Building and improvements      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross 53,735 21,057 73,502
Equipment, furniture, and fixtures      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross 4,382 8,265 4,612
Assembled occupancy      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross 762 1,299 895
Definite-lived intangible assets      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross 0 363 360
Favorable leases      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross 0 393 10,901
Goodwill      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross 13,962 30,343 10,617
Other indefinite-lived intangible assets      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross $ 7,018 $ 1,741 $ 6,285