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Shareholders' equity (Details) - USD ($) | 9 Months Ended | 18 Months Ended | 60 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Dec. 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 |  |
Common stock, par value (in dollars per share) | $ 0.01 |  | $ 0.01 | $ 0.01 |  |
Common stock, shares issued (in shares) | 94,262,108 |  | 94,262,108 | 94,224,571 |  |
Common stock, shares outstanding (in shares) | 87,075,587 |  | 87,075,587 | 87,038,050 |  |
Stock repurchase program, authorized amount |  |  |  | $ 130,000,000 | $ 60,000,000 |
Repurchase of common stock (in shares) |  |  | 0 | 7,186,521 |  |
Repurchase of common stock, aggregate purchase price |  |  |  | $ 86,276,000 |  |
Stock repurchase program, remaining authorized repurchase amount | $ 43,724,000 |  | $ 43,724,000 |  |  |
Preferred stock, shares authorized (in shares) | 5,000,000 |  | 5,000,000 | 5,000,000 |  |
Preferred stock par value (in dollars per share) | $ 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 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  | 0 | 7,186,521 |  |
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Repurchase of common stock (in shares) |  | 0 |  |  |  |
Preferred stock par value (in dollars per share) | $ 0.01 |  | $ 0.01 |  |  |
Preferred shares outstanding (in shares) | 76,378 |  | 76,378 | 76,539 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares, Beginning balance (in shares) | 76,539 | 78,141 |  |  |  |
Repurchase of common stock (in shares) |  | 0 |  |  |  |
Conversion of convertible preferred stock (in shares) | (161) | (1,146) |  |  |  |
Issuance for stock compensation plans (in shares) | 0 | 0 |  |  |  |
Shares, Ending balance (in shares) | 76,378 | 76,995 | 76,378 | 76,539 |  |
Treasury Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Repurchase of common stock (in shares) |  | 2,400,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares, Beginning balance (in shares) | 7,186,521 | 4,786,521 |  |  |  |
Repurchase of common stock (in shares) |  | 2,400,000 |  |  |  |
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] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Repurchase of common stock (in shares) |  | (2,400,000) |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares, Beginning balance (in shares) | 87,038,050 | 89,064,582 |  |  |  |
Repurchase of common stock (in shares) |  | (2,400,000) |  |  |  |
Conversion of convertible preferred stock (in shares) | 16,109 | 114,524 |  |  |  |
Issuance for stock compensation plans (in shares) | 21,428 | 152,597 |  |  |  |
Shares, Ending balance (in shares) | 87,075,587 | 86,931,703 | 87,075,587 | 87,038,050 |  |

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