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Shareholders’ Equity (Details) - USD ($) | 9 Months Ended | 54 Months Ended | 105 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Mar. 31, 2015 | Dec. 31, 2011 | Dec. 31, 2008
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 195,000,000 |  | 195,000,000 | 195,000,000 | 195,000,000 |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  | $ 0.01 | $ 0.01 | $ 0.01 |  |  |
Common stock, shares issued (in shares) | 96,080,288 |  | 96,080,288 | 96,080,288 | 95,289,961 |  |  |
Common stock, shares, outstanding (in shares) | 88,893,767 |  | 88,893,767 | 88,893,767 | 88,103,440 |  |  |
Preferred stock, shares authorized (in shares) | 5,000,000 |  | 5,000,000 | 5,000,000 | 5,000,000 |  |  |
Preferred stock par value (in dollars per share) | $ 0.01 |  | $ 0.01 | $ 0.01 | $ 0.01 |  |  |
Preferred shares issued (in shares) |  |  |  |  |  |  |  | 160,000
Number of shares issued for each share of preferred stock (in shares) | 100 |  | 100 | 100 |  |  |  |
Stock repurchase program, authorized amount | $ 130,000,000.0 |  | $ 130,000,000.0 | $ 130,000,000.0 |  | $ 70,000,000.0 | $ 60,000,000.0 |
Treasury stock, shares, acquired (in shares) |  |  | 0 | 7,186,521 |  |  |  |
Treasury stock, value, acquired, cost method |  |  |  | $ 86,300,000 |  |  |  |
Stock repurchase program, remaining authorized repurchase amount | $ 43,700,000 |  | $ 43,700,000 | $ 43,700,000 |  |  |  |
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred shares outstanding (in shares) | 68,575 |  | 68,575 | 68,575 | 71,967 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Shares, Beginning balance (in shares) | 71,967 | 74,364 |  |  |  |  |  |
Conversion of convertible preferred stock (in shares) | (3,392) | (272) |  |  |  |  |  |
Issuance for stock compensation plans (in shares) | 0 | 0 |  |  |  |  |  |
Shares, Ending balance (in shares) | 68,575 | 74,092 | 68,575 | 68,575 |  |  |  |
Treasury [Member] |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Shares, Beginning balance (in shares) | 7,186,521 | 7,186,521 |  |  |  |  |  |
Conversion of convertible preferred stock (in shares) | 0 | 0 |  |  |  |  |  |
Issuance for stock compensation plans (in shares) | 0 | 0 |  |  |  |  |  |
Shares, Ending balance (in shares) | 7,186,521 | 7,186,521 | 7,186,521 | 7,186,521 |  |  |  |
Common stock [Member] |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Shares, Beginning balance (in shares) | 88,103,440 | 87,544,777 |  |  |  |  |  |
Conversion of convertible preferred stock (in shares) | 339,166 | 27,263 |  |  |  |  |  |
Issuance for stock compensation plans (in shares) | 451,161 | 36,266 |  |  |  |  |  |
Shares, Ending balance (in shares) | 88,893,767 | 87,608,306 | 88,893,767 | 88,893,767 |  |  |  |

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