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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares | 3 Months Ended | 12 Months Ended
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Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Statement of Stockholders' Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Series B 6.75% convertible perpetual preferred stock, cash dividends declared per share | $ 0.00 | $ 16.88 | $ 16.87 | $ 16.88 | $ 16.87 | $ 16.88 | $ 16.87 | $ 16.88 | $ 50.63 | $ 67.50 | $ 67.50
Common stock, cash dividends declared per share | $ 0.54 | $ 0.54 | $ 0.53 | $ 0.53 | $ 0.53 | $ 0.53 | $ 0.52 | $ 0.52 | $ 2.14 | $ 2.10 | $ 2.06

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