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Note 1 - Business and Significant Accounting Policies - Effect of Revision on Balance Sheet Line Items (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2015 | Dec. 31, 2014
Deferred Tax Assets, Net, Noncurrent | $ 57,337,000 |  |  |  |  |  |  |  |  |  | $ 57,337,000 |  |  |  |  |  |
Total assets | 2,623,864,000 | [1] |  |  |  | 2,461,569,000 | [1] |  |  |  | 2,623,864,000 | [1] | 2,461,569,000 | [1] | $ 2,273,982,000 |  |
Deferred Tax Liabilities, Net, Noncurrent | 61,961,000 |  |  |  |  | 36,411,000 |  |  |  |  | 61,961,000 |  | 36,411,000 |  | 28,989,000 |  |
Liability for unrecognized tax benefits | 8,890,000 |  |  |  |  | 6,444,000 |  |  |  |  | 8,890,000 |  | 6,444,000 |  |  |  |
Total liabilities | 1,321,748,000 |  |  |  |  | 1,288,525,000 |  |  |  |  | 1,321,748,000 |  | 1,288,525,000 |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance | 327,255,000 |  |  |  |  | 215,352,000 |  |  |  |  | 327,255,000 |  | 215,352,000 |  | 152,326,000 |  | $ 44,670,000
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total | (4,706,000) |  |  |  |  | (8,175,000) |  |  |  |  | (4,706,000) |  | (8,175,000) |  | (8,164,000) |  | (9,221,000)
Stockholders' Equity Attributable to Parent, Ending Balance | 1,211,378,000 |  |  |  |  | 1,076,690,000 |  |  |  |  | 1,211,378,000 |  | 1,076,690,000 |  | 993,434,000 |  | 777,501,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance | 1,295,700,000 |  |  |  |  | 1,168,272,000 |  |  |  |  | 1,295,700,000 |  | 1,168,272,000 |  | 1,087,307,000 |  | 789,324,000
Income tax (provision) benefit | 28,329,000 |  | $ (6,224,000) | $ (32,765,000) | $ (11,004,000) | (7,356,000) |  | $ (12,109,000) | $ (8,515,000) | $ (9,079,000) | (21,664,000) |  | (37,059,000) |  | 16,057,000 |  |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  | 147,109,000 |  | 96,294,000 |  | 124,148,000 |  |
Net Income (Loss) Attributable to Parent, Total | $ 64,620,000 |  | $ 23,960,000 | $ 8,640,000 | $ 35,194,000 | $ 23,324,000 |  | $ 11,959,000 | $ 23,724,000 | $ 29,701,000 | 132,414,000 |  | 88,708,000 |  | 120,372,000 |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total |  |  |  |  |  |  |  |  |  |  | 135,000 |  | 141,000 |  | 147,000 |  |
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total |  |  |  |  |  |  |  |  |  |  | 151,415,000 |  | 95,876,000 |  | 125,205,000 |  |
Comprehensive income attributable to the Company’s stockholders |  |  |  |  |  |  |  |  |  |  | $ 135,883,000 |  | $ 88,697,000 |  | $ 121,429,000 |  |
Basic: (in dollars per share) | $ 1.28 |  | $ 0.48 | $ 0.17 | $ 0.71 | $ 0.47 |  | $ 0.24 | $ 0.48 | $ 0.60 | $ 2.64 |  | $ 1.79 |  | $ 2.48 |  |
Diluted: (in dollars per share) | $ 1.27 |  | $ 0.47 | $ 0.17 | $ 0.70 | $ 0.46 |  | $ 0.24 | $ 0.47 | $ 0.60 | $ 2.61 |  | $ 1.77 |  | $ 2.45 |  |
Total stockholders’ equity attributable to the Company’s stockholders |  |  |  |  |  |  |  |  |  |  | $ 146,057,000 |  | $ 96,010,000 |  | $ 124,148,000 |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total | $ 68,087,000 |  | $ 27,559,000 | $ 11,846,000 | $ 39,617,000 | $ 26,326,000 |  | $ 14,285,000 | $ 24,308,000 | $ 31,375,000 | 147,109,000 |  | 96,294,000 |  | 124,148,000 |  |
Deferred income tax provision |  |  |  |  |  |  |  |  |  |  | (41,147,000) |  | 23,222,000 |  | (39,962,000) |  |
Liability for unrecognized tax benefits |  |  |  |  |  |  |  |  |  |  | 3,270,000 |  | (4,174,000) |  | 3,107,000 |  |
Accounts payable and accrued expenses |  |  |  |  |  |  |  |  |  |  | 51,641,000 |  | (1,375,000) |  | (939,000) |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  | 245,575,000 |  | 159,285,000 |  | 190,025,000 |  |
Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Net, Noncurrent | 20,135,000 |  |  |  |  |  |  |  |  |  | 20,135,000 |  |  |  |  |  |
Total assets | 2,586,662,000 |  |  |  |  | 2,461,569,000 |  |  |  |  | 2,586,662,000 |  | 2,461,569,000 |  |  |  |
Deferred Tax Liabilities, Net, Noncurrent |  |  |  |  |  | 35,382,000 |  |  |  |  |  |  | 35,382,000 |  |  |  |
Liability for unrecognized tax benefits | 8,890,000 |  |  |  |  | 5,738,000 |  |  |  |  | 8,890,000 |  | 5,738,000 |  |  |  |
Total liabilities | 1,259,787,000 |  |  |  |  | 1,286,790,000 |  |  |  |  | 1,259,787,000 |  | 1,286,790,000 |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance | 351,622,000 |  |  |  |  | 216,644,000 |  |  |  |  | 351,622,000 |  | 216,644,000 |  | 148,396,000 |  | 41,539,000
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total | (4,314,000) |  |  |  |  | (7,732,000) |  |  |  |  | (4,314,000) |  | (7,732,000) |  | (7,667,000) |  | (8,668,000)
Stockholders' Equity Attributable to Parent, Ending Balance | 1,236,137,000 |  |  |  |  | 1,078,425,000 |  |  |  |  | 1,236,137,000 |  | 1,078,425,000 |  | 990,001,000 |  | 774,923,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance | 1,320,459,000 |  |  |  |  | 1,170,007,000 |  |  |  |  | 1,320,459,000 |  | 1,170,007,000 |  | 1,083,874,000 |  | 786,746,000
Income tax (provision) benefit |  |  |  |  |  |  |  |  |  |  | 1,411,000 |  | (31,837,000) |  | 15,258,000 |  |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  | 170,184,000 |  | 101,516,000 |  | 123,349,000 |  |
Net Income (Loss) Attributable to Parent, Total |  |  |  |  |  |  |  |  |  |  | 155,489,000 |  | 93,930,000 |  | 119,573,000 |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total |  |  |  |  |  |  |  |  |  |  | 84,000 |  | 87,000 |  | 91,000 |  |
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total |  |  |  |  |  |  |  |  |  |  | 174,439,000 |  | 101,044,000 |  | 124,350,000 |  |
Comprehensive income attributable to the Company’s stockholders |  |  |  |  |  |  |  |  |  |  | $ 158,907,000 |  | $ 93,865,000 |  | $ 120,574,000 |  |
Basic: (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 3.10 |  | $ 1.90 |  | $ 2.46 |  |
Diluted: (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 3.06 |  | $ 1.87 |  | $ 2.43 |  |
Total stockholders’ equity attributable to the Company’s stockholders |  |  |  |  |  |  |  |  |  |  | $ 169,132,000 |  | $ 101,232,000 |  | $ 123,349,000 |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total |  |  |  |  |  |  |  |  |  |  | 170,184,000 |  | 101,516,000 |  | 123,349,000 |  |
Deferred income tax provision |  |  |  |  |  |  |  |  |  |  | (64,104,000) |  | 18,473,000 |  | (39,530,000) |  |
Liability for unrecognized tax benefits |  |  |  |  |  |  |  |  |  |  | 3,152,000 |  | (4,647,000) |  | 2,874,000 |  |
Accounts payable and accrued expenses |  |  |  |  |  |  |  |  |  |  | 51,641,000 |  | (1,375,000) |  | (339,000) |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  | 245,575,000 |  | 159,285,000 |  | 190,025,000 |  |
Restatement Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Net, Noncurrent | 37,202,000 |  |  |  |  |  |  |  |  |  | 37,202,000 |  |  |  |  |  |
Total assets | 37,202,000 |  |  |  |  |  |  |  |  |  | 37,202,000 |  |  |  |  |  |
Deferred Tax Liabilities, Net, Noncurrent | 61,961,000 |  |  |  |  | 1,029,000 |  |  |  |  | 61,961,000 |  | 1,029,000 |  |  |  |
Liability for unrecognized tax benefits |  |  |  |  |  | 706,000 |  |  |  |  |  |  | 706,000 |  |  |  |
Total liabilities | 61,961,000 |  |  |  |  | 1,735,000 |  |  |  |  | 61,961,000 |  | 1,735,000 |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance | (24,367,000) |  |  |  |  | (1,292,000) |  |  |  |  | (24,367,000) |  | (1,292,000) |  | 3,930,000 | $ 3,100,000 | 3,131,000
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total | (392,000) |  |  |  |  | (443,000) |  |  |  |  | (392,000) |  | (443,000) |  | (497,000) |  | (553,000)
Stockholders' Equity Attributable to Parent, Ending Balance | (24,759,000) |  |  |  |  | (1,735,000) |  |  |  |  | (24,759,000) |  | (1,735,000) |  | 3,433,000 |  | 2,578,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance | (24,759,000) |  |  |  |  | (1,735,000) |  |  |  |  | (24,759,000) |  | (1,735,000) |  | 3,433,000 |  | $ 2,578,000
Income tax (provision) benefit | (1,300,000) |  |  |  |  | (4,900,000) |  |  |  |  | (23,075,000) |  | (5,222,000) |  | 799,000 |  |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  | (23,075,000) |  | (5,222,000) |  | 799,000 |  |
Net Income (Loss) Attributable to Parent, Total | $ (1,300,000) |  |  |  |  | $ (4,900,000) |  |  |  |  | (23,075,000) |  | (5,222,000) |  | 799,000 |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total |  |  |  |  |  |  |  |  |  |  | 51,000 |  | 54,000 |  | 56,000 |  |
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total |  |  |  |  |  |  |  |  |  |  | (23,024,000) |  | (5,168,000) |  | 855,000 |  |
Comprehensive income attributable to the Company’s stockholders |  |  |  |  |  |  |  |  |  |  | $ (23,024,000) |  | $ (5,168,000) |  | $ 855,000 |  |
Basic: (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ (0.46) |  | $ (0.11) |  | $ 0.02 |  |
Diluted: (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ (0.45) |  | $ (0.10) |  | $ 0.02 |  |
Total stockholders’ equity attributable to the Company’s stockholders |  |  |  |  |  |  |  |  |  |  | $ (23,075,000) |  | $ (5,222,000) |  | $ 799,000 |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total |  |  |  |  |  |  |  |  |  |  | (23,075,000) |  | (5,222,000) |  | 799,000 |  |
Deferred income tax provision |  |  |  |  |  |  |  |  |  |  | 22,957,000 |  | 4,749,000 |  | (432,000) |  |
Liability for unrecognized tax benefits |  |  |  |  |  |  |  |  |  |  | 118,000 |  | 473,000 |  | 233,000 |  |
Accounts payable and accrued expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (600,000) |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Electricity segment assets include goodwill in the amount of $21.0 million and $6.7 million as of December 31, 2017 and 2016, respectively.

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