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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Treasury Stock | Accumulated Deficit | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 735,618 | $ 769 | $ 3,093,058 | $ 1,197 | $ (76,732) | $ (2,241,243) | $ (41,431)
Beginning, shares at Dec. 31, 2017 |  | 76,880,862 |  |  | (5,930,380) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Cash dividends | (24,018) |  |  |  |  | (24,018) |
Shares issued in employee stock purchase plan | 416 | $ 1 | 415 |  |  |  |
Shares issued in employee stock purchase plan, shares |  | 50,046 |  |  |  |  |
Stock-based compensation, net of forfeitures | 3,513 | $ 9 | 3,568 |  |  |  | (64)
Stock-based compensation, net of forfeitures, shares |  | 883,271 |  |  | (32,905) |  |
Stock options exercised | 262 |  | 262 |  |  |  |
Stock options exercised, shares |  | 29,855 |  |  |  |  |
Merger-related adjustments | 94,292 | $ 576 | 52,815 |  |  |  | 40,901
Merger-related adjustments, shares |  | 57,634,005 |  |  |  |  |
Treasury stock purchased | (1,041) |  |  |  | $ (1,041) |  |
Treasury stock purchased, shares |  |  |  |  | (109,466) |  |
Cash distribution to noncontrolling unitholders of the Partnership | (11,766) |  |  |  |  |  | (11,766)
Comprehensive income |  |  |  |  |  |  |
Net income (loss) | 6,218 |  |  |  |  | (1,879) | 8,097
Interest rate swap gain (loss), net of reclassifications to earnings | 6,282 |  |  | 2,019 |  |  | 4,263
Amortization of terminated interest rate swaps | 230 |  |  | 230 |  |  |
Merger-related adjustments | 5,670 |  |  | 5,670 |  |  |
Impact of adoption of ASU 2018-02 |  |  |  | 258 |  | (258) |
Ending balance at Jun. 30, 2018 | 830,725 | $ 1,355 | 3,150,118 | 9,374 | $ (77,773) | (2,252,349) | 0
Ending, shares at Jun. 30, 2018 |  | 135,478,039 |  |  | (6,072,751) |  |
Beginning balance at Mar. 31, 2018 | 737,873 | $ 778 | 3,094,881 | 3,194 | $ (77,773) | (2,238,800) | (44,407)
Beginning, shares at Mar. 31, 2018 |  | 77,779,797 |  |  | (6,072,751) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Cash dividends | (15,486) |  |  |  |  | (15,486) |
Shares issued in employee stock purchase plan | 193 | $ 1 | 192 |  |  |  |
Shares issued in employee stock purchase plan, shares |  | 23,092 |  |  |  |  |
Stock-based compensation, net of forfeitures | 1,968 |  | 1,968 |  |  |  |
Stock-based compensation, net of forfeitures, shares |  | 11,290 |  |  |  |  |
Stock options exercised | 262 |  | 262 |  |  |  |
Stock options exercised, shares |  | 29,855 |  |  |  |  |
Merger-related adjustments | 94,292 | $ 576 | 52,815 |  |  |  | 40,901
Merger-related adjustments, shares |  | 57,634,005 |  |  |  |  |
Comprehensive income |  |  |  |  |  |  |
Net income (loss) | 4,149 |  |  |  |  | 1,937 | 2,212
Interest rate swap gain (loss), net of reclassifications to earnings | 1,720 |  |  | 426 |  |  | 1,294
Amortization of terminated interest rate swaps | 85 |  |  | 85 |  |  |
Merger-related adjustments | 5,670 |  |  | 5,670 |  |  |
Ending balance at Jun. 30, 2018 | 830,725 | $ 1,355 | 3,150,118 | 9,374 | $ (77,773) | (2,252,349) | 0
Ending, shares at Jun. 30, 2018 |  | 135,478,039 |  |  | (6,072,751) |  |
Beginning balance at Dec. 31, 2018 | 841,574 | $ 1,358 | 3,177,982 | 5,773 | $ (79,862) | (2,263,677) | 0
Beginning, shares at Dec. 31, 2018 |  | 135,787,509 |  |  | (6,381,605) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Cash dividends | (34,437) |  |  |  |  | (34,437) |
Shares issued in employee stock purchase plan | 407 |  | 407 |  |  |  |
Shares issued in employee stock purchase plan, shares |  | 48,801 |  |  |  |  |
Stock-based compensation, net of forfeitures | 3,869 | $ 11 | 3,858 |  |  |  |
Stock-based compensation, net of forfeitures, shares |  | 1,062,987 |  |  | (108,917) |  |
Treasury stock purchased | (857) |  |  |  | $ (857) |  |
Treasury stock purchased, shares |  |  |  |  | (87,036) |  |
Comprehensive income |  |  |  |  |  |  |
Net income (loss) | 30,879 |  |  |  |  | 30,879 |
Interest rate swap gain (loss), net of reclassifications to earnings | (8,545) |  |  | (8,545) |  |  |
Amortization of terminated interest rate swaps | 0 |  |  |  |  |  |
Merger-related adjustments |  |  |  | 0 |  |  |
Ending balance at Jun. 30, 2019 | 832,890 | $ 1,369 | 3,182,247 | (2,772) | $ (80,719) | (2,267,235) | 0
Ending, shares at Jun. 30, 2019 |  | 136,899,297 |  |  | (6,577,558) |  |
Beginning balance at Mar. 31, 2019 | 842,292 | $ 1,369 | 3,180,546 | 2,548 | $ (80,719) | (2,261,452) | 0
Beginning, shares at Mar. 31, 2019 |  | 136,876,352 |  |  | (6,484,075) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Cash dividends | (17,206) |  |  |  |  | (17,206) |
Shares issued in employee stock purchase plan | 189 |  | 189 |  |  |  |
Shares issued in employee stock purchase plan, shares |  | 19,073 |  |  |  |  |
Stock-based compensation, net of forfeitures | 1,512 |  | 1,512 |  |  |  |
Stock-based compensation, net of forfeitures, shares |  | 3,872 |  |  | (93,483) |  |
Comprehensive income |  |  |  |  |  |  |
Net income (loss) | 11,423 |  |  |  |  | 11,423 |
Interest rate swap gain (loss), net of reclassifications to earnings | (5,320) |  |  | (5,320) |  |  |
Amortization of terminated interest rate swaps | 0 |  |  |  |  |  |
Merger-related adjustments |  |  |  | 0 |  |  |
Ending balance at Jun. 30, 2019 | $ 832,890 | $ 1,369 | $ 3,182,247 | $ (2,772) | $ (80,719) | $ (2,267,235) | $ 0
Ending, shares at Jun. 30, 2019 |  | 136,899,297 |  |  | (6,577,558) |  |

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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4590271-111686 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | instant