Share-based compensation (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of management and director options activity

The management and director options activity for the years ended December 31, 2015, 2014 and 2013 were as follows:

	Number of options		Weighted average exercise price
Balances as of January 1, 2013	10,956,838		$	13.20
Granted	348,836		14.09
Forfeited	(324,599	)	13.20
Balances as of December 31, 2013	10,981,075		13.23
Granted	348,836		18.25
Forfeited	(279,070	)	13.20
Exercised	(60,000	)	10.00
Balances as of December 31, 2014	10,990,841		13.41
Forfeited	(306,976	)	14.36
Exercised	(433,279	)	10.00
Balances as of December 31, 2015	10,250,586		$	13.52

Schedule of management and director options outstanding

The following table summarizes information about the Company’s management and director share options outstanding as of December 31, 2015:

	Options outstanding			Options exercisable
Range of exercise prices	Number of options	Weighted average exercise price	Remaining contractual life	Number of options	Weighted average exercise price
$10.00 - $10.89	5,788,392	$10.03	5.97	3,946,530	$10.02
$15.05 - $16.89	2,265,981	$15.94	6.06	1,526,448	$15.96
$20.00 - $25.05	2,196,213	$20.22	6.00	1,498,541	$20.13
	10,250,586	$13.52	5.99	6,971,519	$13.49

Schedule of restricted share award activity

Restricted share award activity for the restricted shares with only a service condition for the years ended December 31, 2015, 2014 and 2013 was as follows:

	Number of non- vested restricted shares		Weighted average grant date fair value
Balance as of January 1, 2013	619,300		$	10.00
Granted	37,856		15.22
Balance as of December 31, 2013	657,156		10.30
Granted	49,684		15.39
Forfeited	(17,800	)	10.00
Vested	(72,926	)	15.56
Balance as of December 31, 2014	616,114		10.10
Granted	118,120		13.06
Forfeited	(7,267	)	13.76
Vested	(425,924	)	10.37
Balance as of December 31, 2015	301,043		$	11.31

Schedule of restricted shares with a service and performance condition activity

Restricted share award activity for the restricted shares with a service and performance condition for the years ended December 31, 2015 and 2014 was as follows:

	Number of non- vested restricted shares		Number of non- vested restricted shares probable of vesting		Weighted average grant date fair value
Balance as of January 1, 2014	—		—		$	—
Granted	459,746		306,496		14.60
Balance as of December 31, 2014	459,746		306,496		14.60
Granted	514,276		342,846		14.00
Forfeited	(52,469	)	(34,980	)	14.29
Change in estimated restricted shares considered probable of vesting	—		(78,128	)	14.60
Balance as of December 31, 2015	921,553		536,234		$	14.24