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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income (loss) $ 46,595 $ 66,390 $ (895)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation 142,111 151,063 123,995
Amortization 24,294 25,944 19,690
Amortization reflected as rent expense in cost of services 342 1,528 728
Bad debt expense 1,983 2,179 2,456
Waived management fee 4,959 3,580 3,021
Waived management fee 37,763 36,056 24,596
Deferred income taxes 6,208 (54,055) (52,875)
(Gain) loss on investments 275 (450) (143)
Net (gain) loss from patronage and equity investments (3,388) (3,008) (795)
Amortization of long-term debt issuance costs 3,666 4,741 3,914
Net benefit from retirement plans (1,688) (1,388) (4,396)
Accrued interest and other 0 416 1,414
Changes in assets and liabilities:      
Accounts receivable 239 16,451 14,581
Inventory, net 439 33,339 (30,288)
Income taxes receivable 12,029 (19,138) 7,694
Other assets (16,246) 1,439 5,273
Accounts payable (1,377) (36,725) 42,496
Income taxes payable 0 0 435
Deferred lease 4,723 327 4,273
Other deferrals and accruals 2,720 (5,759) (3,648)
Net cash provided by (used in) operating activities 265,647 222,930 161,526
Cash flows from investing activities:      
Acquisition of property, plant and equipment (136,641) (146,489) (173,231)
Proceeds from sale of assets 840 980 5,510
Cash disbursed for acquisition, net of cash acquired (52,000) (6,000) (657,354)
Release of restricted cash 0 0 2,167
Cash distributions (contributions) from investments and other 1 14 2,895
Net cash provided by (used in) investing activities (187,800) (151,495) (820,013)
Cash flows from financing activities:      
Principal payments on long-term debt (51,264) (36,375) (213,793)
Proceeds from revolving credit facility borrowings 15,000 0 0
Proceeds from credit facility borrowings 0 25,000 860,000
Principal payments on revolving credit facility (15,000) 0 0
Payments for debt issuance costs (3,971) 0 (14,910)
Dividends paid, net of dividends reinvested (12,866) (12,257) (11,705)
Taxes paid for equity award issuances (3,245) (5,411) (5,097)
Proceeds from issuance of common stock 0 0 3,373
Net cash provided by (used in) financing activities (71,346) (29,043) 617,868
Net increase (decrease) in cash and cash equivalents 6,501 42,392 (40,619)
Cash and cash equivalents, beginning of period 78,585 36,193 76,812
Cash and cash equivalents, end of period 85,086 78,585 36,193
Supplemental Disclosures of Cash Flow Information      
Interest, net of capitalized interest of $1,556; $1,559 and $1,374 in 2018, 2017 and 2016, respectively 33,034 33,495 21,187
Income tax (refunds received) paid, net (2,721) 20,066 44,983
Capital expenditures payable 23,501 7,254 14,386
Common stock issued to acquire non-controlling interest in nTelos     10,400
Unamortized loan allocation to long term debt, current maturities     5,200
Increase in fair value of interest rate swaps   2,000  
Increase in deferred tax liabilities   500  
Increase in accumulated other comprehensive income $ 50 $ 1,442 $ 6,373