Share-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based compensation
Total compensation expense		$ 3,975	$ 9,647	$ 9,439
Income tax benefits		$ 1,143	2,404	2,732
Performance share units
Share-based compensation
Stock options vesting period		3 years
Total compensation expense		$ 2,320	6,263	6,860
Expense		$ 3,585
Weighted average period (years)		1 year 4 months 24 days
Cash payment in settlement of Performance Share Unit Plan Units		$ 6,375	$ 6
Status of, and changes in, the Performance Share Unit Plan units granted to employees
Outstanding at the beginning of the period (in shares)		521,295
Granted (in shares)		204,864
Forfeited (in shares)		(55,316)
Exercised (in shares)		(230,754)
Outstanding at the end of the period (in shares)		440,089	521,295
Vested and expected to vest (in shares)		440,089
Lifeco
Share-based compensation
Number of trading days considered for determination of average closing price of common stock		20 days
Lifeco | Option
Share-based compensation
Period preceding the date of the grant, to determine exercise price of options granted		5 days
Options exercisable, term		10 years
Maximum period that retiring option holders can continue to exercise outstanding options		5 years
Total compensation expense		$ 1,655	$ 3,384	$ 2,579
Expense		$ 2,238
Weighted average period (years)		1 year 8 months 12 days
Granted (in shares)		714,101
Compensation expense to be recognized		$ 2,376
Shares under option
Outstanding at the beginning of the period (in shares)		3,793,658
Granted (in shares)		714,101
Exercised (in shares)		(692,756)
Cancelled and Expired (in shares)		(181,660)
Outstanding at the end of the period (in shares)		3,633,343	3,793,658
Vested and expected to vest at the end of the period (in shares)		3,633,343
Exercisable at the end of the period (in shares)		2,360,613
Exercise price (Whole dollars)
Outstanding at the beginning of the period (in dollars per share)		$ 26.49
Granted (in dollars per share)		25.74
Exercised (in dollars per share)		20.39
Cancelled and Expired (in dollars per share)		21.95
Outstanding at the end of the period (in dollars per share)		21.68	$ 26.49
Vested and expected to vest at the end of the period (in dollars per share)		21.68
Exercisable at the end of the period (in dollars per share)		$ 21.01
Remaining contractual term
Outstanding, December 31, 2015		5 years 10 months 24 days
Vested and expected to vest, December 31, 2015		5 years 10 months 24 days
Exercisable, December 31, 2015		4 years 8 months 12 days
Aggregate intrinsic value
Outstanding, December 31, 2015	[1]	$ 13,154
Vested and expected to vest, December 31, 2015	[1]	13,154
Exercisable, December 31, 2015	[1]	$ 10,078
Other information
Weighted average fair value of options granted (in dollars per share)		$ 3.33	$ 5.53	$ 4.56
Intrinsic value of options exercised	[2]	$ 4,234	$ 401	$ 1,437
Fair value of options vested		$ 1,670	$ 4,491	$ 1,843
Weighted-average assumptions
Dividend yield		3.66%	3.95%	4.53%
Expected volatility		19.10%	26.63%	26.73%
Risk free interest rate		0.90%	1.75%	1.38%
Expected duration (years)		6 years	6 years	6 years
Lifeco | Performance share units
Share-based compensation
Number of shares considered for valuation of each stock award		1

[1] The aggregate intrinsic value is calculated as the difference between the market price of Lifeco common shares on December 31, 2015, and the exercise price of the option (only if the result is positive) multiplied by the number of options.

[2] The intrinsic value of options exercised is calculated as the difference between the market price of Lifeco common shares on the date of exercise and the exercise price of the option multiplied by the number of options exercised.