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Condensed Consolidating Financial Information (Statements of Cash Flows) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities $ 209,808 $ 206,443
Cash flows from investing activities:    
Sale of investment securities 14,895 23,066
Maturities of investment securities 16,899 94,858
Purchase of investment securities (22,516) (120,362)
Proceeds from sale or liquidation of long-term investments 0 966
Purchase of long-term investments 0 (26,500)
Investments in real estate ventures (6,132) (20,830)
Acquisition of a business (370) (6,569)
Distributions from investments in real estate ventures 37,819 23,338
Increase in cash surrender value of life insurance policies (806) (831)
Decrease in restricted assets 254 2,112
Issuance of notes receivable 0 (1,633)
Investments in subsidiaries 0 0
Proceeds from sale of fixed assets 0 75
Capital expenditures (12,546) (15,258)
Repayments of notes receivable 67 0
Pay downs of investment securities 1,293 2,153
Investments in real estate, net (1,495) (357)
Net cash provided by (used in) investing activities 27,362 (45,772)
Cash flows from financing activities:    
Proceeds from issuance of debt 0 850,021
Deferred financing costs 0 (19,200)
Repayments of debt (1,490) (836,600)
Borrowings under revolver 261,058 121,521
Repayments on revolver (264,654) (152,870)
Capital contributions received 0 0
Intercompany dividends paid 0 0
Dividends and distributions on common stock (169,571) (158,425)
Proceeds from issuance of Vector common stock 0 43,230
Distributions to non-controlling interest (2,521) (165)
Net cash used in financing activities (177,178) (152,488)
Net increase in cash, cash equivalents and restricted cash 59,992 8,183
Cash, cash equivalents and restricted cash, beginning of period 310,937 398,578
Cash, cash equivalents and restricted cash, end of period 370,929 406,761
Consolidating Adjustments    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities (174,152) (159,728)
Cash flows from investing activities:    
Sale of investment securities 0 0
Maturities of investment securities 0 0
Purchase of investment securities 0 0
Proceeds from sale or liquidation of long-term investments   0
Purchase of long-term investments   0
Investments in real estate ventures 0 0
Acquisition of a business 0 0
Distributions from investments in real estate ventures 0 0
Increase in cash surrender value of life insurance policies 0 0
Decrease in restricted assets 0 0
Issuance of notes receivable   0
Investments in subsidiaries 8,103 20,245
Proceeds from sale of fixed assets   0
Capital expenditures 0 0
Repayments of notes receivable (20,000)  
Pay downs of investment securities 0 0
Investments in real estate, net 0 0
Net cash provided by (used in) investing activities (11,897) 20,245
Cash flows from financing activities:    
Proceeds from issuance of debt   0
Deferred financing costs   0
Repayments of debt 20,000 0
Borrowings under revolver 0 0
Repayments on revolver 0 0
Capital contributions received (8,103) (20,245)
Intercompany dividends paid 174,152 159,728
Dividends and distributions on common stock 0 0
Proceeds from issuance of Vector common stock   0
Distributions to non-controlling interest 0 0
Net cash used in financing activities 186,049 139,483
Net increase in cash, cash equivalents and restricted cash 0 0
Cash, cash equivalents and restricted cash, beginning of period 0 0
Cash, cash equivalents and restricted cash, end of period 0 0
Parent/Issuer | Reportable Legal Entities    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 118,890 91,858
Cash flows from investing activities:    
Sale of investment securities 10,940 23,066
Maturities of investment securities 16,899 94,858
Purchase of investment securities (22,516) (120,362)
Proceeds from sale or liquidation of long-term investments   500
Purchase of long-term investments   (26,500)
Investments in real estate ventures 0 0
Acquisition of a business 0 0
Distributions from investments in real estate ventures 0 0
Increase in cash surrender value of life insurance policies (345) (371)
Decrease in restricted assets 14 231
Issuance of notes receivable   0
Investments in subsidiaries (8,103) (20,245)
Proceeds from sale of fixed assets   0
Capital expenditures (15) (31)
Repayments of notes receivable 20,000  
Pay downs of investment securities 1,293 2,153
Investments in real estate, net 0 0
Net cash provided by (used in) investing activities 18,167 (46,701)
Cash flows from financing activities:    
Proceeds from issuance of debt   850,000
Deferred financing costs   (19,200)
Repayments of debt 0 (835,000)
Borrowings under revolver 0 0
Repayments on revolver 0 0
Capital contributions received 0 0
Intercompany dividends paid 0 0
Dividends and distributions on common stock (169,571) (158,425)
Proceeds from issuance of Vector common stock   43,230
Distributions to non-controlling interest 0 0
Net cash used in financing activities (169,571) (119,395)
Net increase in cash, cash equivalents and restricted cash (32,514) (74,238)
Cash, cash equivalents and restricted cash, beginning of period 194,719 279,815
Cash, cash equivalents and restricted cash, end of period 162,205 205,577
Subsidiary Guarantors | Reportable Legal Entities    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 244,377 231,182
Cash flows from investing activities:    
Sale of investment securities 3,955 0
Maturities of investment securities 0 0
Purchase of investment securities 0 0
Proceeds from sale or liquidation of long-term investments   0
Purchase of long-term investments   0
Investments in real estate ventures 0 0
Acquisition of a business 0 0
Distributions from investments in real estate ventures 0 0
Increase in cash surrender value of life insurance policies (461) (460)
Decrease in restricted assets 240 1,784
Issuance of notes receivable   0
Investments in subsidiaries 0 0
Proceeds from sale of fixed assets   75
Capital expenditures (4,175) (2,682)
Repayments of notes receivable 0  
Pay downs of investment securities 0 0
Investments in real estate, net 0 0
Net cash provided by (used in) investing activities (441) (1,283)
Cash flows from financing activities:    
Proceeds from issuance of debt   0
Deferred financing costs   0
Repayments of debt (21,263) (1,465)
Borrowings under revolver 261,058 121,521
Repayments on revolver (264,654) (152,870)
Capital contributions received 650 550
Intercompany dividends paid (128,308) (124,783)
Dividends and distributions on common stock 0 0
Proceeds from issuance of Vector common stock   0
Distributions to non-controlling interest 0 0
Net cash used in financing activities (152,517) (157,047)
Net increase in cash, cash equivalents and restricted cash 91,419 72,852
Cash, cash equivalents and restricted cash, beginning of period 20,175 19,684
Cash, cash equivalents and restricted cash, end of period 111,594 92,536
Subsidiary Non-Guarantors | Reportable Legal Entities    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 20,693 43,131
Cash flows from investing activities:    
Sale of investment securities 0 0
Maturities of investment securities 0 0
Purchase of investment securities 0 0
Proceeds from sale or liquidation of long-term investments   466
Purchase of long-term investments   0
Investments in real estate ventures (6,132) (20,830)
Acquisition of a business (370) (6,569)
Distributions from investments in real estate ventures 37,819 23,338
Increase in cash surrender value of life insurance policies 0 0
Decrease in restricted assets 0 97
Issuance of notes receivable   (1,633)
Investments in subsidiaries 0 0
Proceeds from sale of fixed assets   0
Capital expenditures (8,356) (12,545)
Repayments of notes receivable 67  
Pay downs of investment securities 0 0
Investments in real estate, net (1,495) (357)
Net cash provided by (used in) investing activities 21,533 (18,033)
Cash flows from financing activities:    
Proceeds from issuance of debt   21
Deferred financing costs   0
Repayments of debt (227) (135)
Borrowings under revolver 0 0
Repayments on revolver 0 0
Capital contributions received 7,453 19,695
Intercompany dividends paid (45,844) (34,945)
Dividends and distributions on common stock 0 0
Proceeds from issuance of Vector common stock   0
Distributions to non-controlling interest (2,521) (165)
Net cash used in financing activities (41,139) (15,529)
Net increase in cash, cash equivalents and restricted cash 1,087 9,569
Cash, cash equivalents and restricted cash, beginning of period 96,043 99,079
Cash, cash equivalents and restricted cash, end of period $ 97,130 $ 108,648