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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 26,692 $ 14,802
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 4,527 3,985
Stock based compensation 235 19
Loss (gain) on sale of investments 1,086 (10,861)
Unrealized gain on investments, net (729)  
Other-than-temporary impairment loss 63  
Other-than-temporary impairment loss   366
Deferred income tax (benefit) expense (54) 3,488
Impairment loss on investment in real estate 99  
Cost of real estate sold 6,545 3,426
Expenditures for and acquisition of real estate to be sold (8,288) (5,021)
Accretion income and other (1,038) (1,899)
Loss on disposal of property and equipment 8 29
Changes in operating assets and liabilities:    
Notes receivable (381) (808)
Other assets (157) (2,657)
Other liabilities 2,184 14,093
Income taxes receivable 6,720 26,671
Net cash provided by operating activities 37,512 45,633
Cash flows from investing activities:    
Expenditures for operating property (9,659) (15,646)
Expenditures for property and equipment (1,252) (1,271)
Proceeds from the disposition of assets 5,000  
Purchases of investments - debt securities (38) (74,740)
Purchases of investments - equity securities (10,442) (19,081)
Sales of investments - debt securities 64,630 102,065
Sales of investments - equity securities 7,328 8,324
Maturities of assets held by special purpose entities 414 415
Net cash provided by investing activities 55,981 66
Cash flows from financing activities:    
Capital contribution from non-controlling interest 887 141
Repurchase of common shares (72,463) (40,444)
Borrowings on debt 5,737 1,188
Principal payments for debt (871) (838)
Debt issuance costs (1,158) (20)
Net cash used in financing activities (67,868) (39,973)
Net increase in cash, cash equivalents and restricted cash 25,625 5,726
Cash, cash equivalents and restricted cash at beginning of the period 192,365 243,087
Cash, cash equivalents and restricted cash at end of the period $ 217,990 $ 248,813