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Note 14 - Selected Financial Information of Registrant (Tables) | 3 Months Ended
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Mar. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Selected Financial Information Of Registrant [Table Text Block] |
(In thousands) | March 31, 2016 |  | December 31, 2015
Investment in subsidiaries, at equity in net assets | $ | 3,120,807 |  |  | $ | 3,001,846 |
Total assets | 4,210,871 |  |  | 3,992,716 |
Long-term debt | 1,286,466 |  |  | 1,219,454 |
Total liabilities | 1,550,473 |  |  | 1,495,785 |
Total stockholders’ equity | 2,660,398 |  |  | 2,496,931 |
Total liabilities and stockholders’ equity | 4,210,871 |  |  | 3,992,716 |

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- Definition Tabular disclosure of condensed financial statements, including, but not limited to, the balance sheet, income statement, and statement of cash flows. + References No definition available. + Details
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