Annual report pursuant to Section 13 and 15(d)

Schedule III Combined Real Estate and Accumulated Depreciation - Cost and Accumulated Depreciation (Detail)

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Schedule III Combined Real Estate and Accumulated Depreciation - Cost and Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cost:      
Balance at beginning of period $ 4,243,308 $ 2,491,702 $ 2,177,983
Acquisitions through foreclosure 0 0 0
Other acquisitions 22,638 1,714,029 278,572
Improvements, etc. 84,191 73,385 42,046
Additions during period other acquisitions, improvements, total 106,829 1,787,414 320,618
Cost of assets disposed (28,727) (35,808) (6,899)
Impairment write-down 0 0 0
Casualty loss 0 0 0
Deductions during period (28,727) (35,808) (6,899)
Balance at close of period 4,321,410 4,243,308 2,491,702
Accumulated Depreciation:      
Balance at beginning of period 535,704 465,195 411,701
Depreciation expense 102,674 87,219 55,101
Additions during period depreciation expense, total 102,674 87,219 55,101
Accumulated depreciation of assets disposed (14,064) (16,710) (1,607)
Accumulated depreciation on impaired asset 0 0 0
Accumulated depreciation on casualty loss 0 0 0
Deductions during period (14,064) (16,710) (1,607)
Balance at close of period $ 624,314 $ 535,704 $ 465,195