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Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands					3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 15, 2015	Mar. 31, 2015	Mar. 13, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Class of Stock [Line Items]
Dividends declared per common share, in usd per share					$ 0.3	$ 0.29	$ 0.6	$ 0.58
Dividends declared and paid, Preference shares					$ 5,596	$ 5,596	$ 11,191	$ 11,191
Retained Earnings
Class of Stock [Line Items]
Dividends declared and paid, Preference shares							11,191	11,191
Dividends declared and paid, Common shares							27,479	23,550
Common shares repurchased during period, Aggregate amount							$ 0	$ 313,312
Common Shares
Class of Stock [Line Items]
Dividends declared per common share, in usd per share		$ 0.3		$ 0.30
Dividends per common share, in usd per share	$ 0.3		$ 0.3
Common shares repurchased during period, Number of shares							83
Common shares repurchased during period, Aggregate amount							$ 8,400
Common shares repurchased during period, Average cost per share							$ 101.99
Share repurchase program, Remaining authorized aggregate amount	$ 491,900				$ 491,900		$ 491,900

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