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Share-based compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of share-based compensation expense

The following table provides the total share-based compensation expense included in general and administrative expenses during the years ended December 31, 2020, 2019 and 2018:

			2020						2019						2018
Management and director options			$	—					$	—					$	275
Restricted shares with service condition			2,812						1,927						611
Restricted shares with service and performance condition			3,824						5,134						4,070
			$	6,636					$	7,061					$	4,956

Schedule of management and director options activity

The management and director options activity for the years ended December 31, 2020, 2019 and 2018 were as follows:

			Number of options						Weighted average exercise price
Balance as of January 1, 2018			8,888,053						$	13.43
Forfeited			—						—
Exercised			—						—
Balance as of January 1, 2019			8,888,053						13.43
Forfeited			(393,717)						14.73
Exercised			(187,678)						10.00
Balance as of January 1, 2020			8,306,658						13.45
Forfeited			—						—
Exercised			—						—
Balance as of December 31, 2020			8,306,658						$	13.45

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, 2020:

			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			4,774,694						$	10.04					1.1 years						4,774,694						$	10.04
$15.05 - $16.89			1,800,866						$	15.92					1.3 years						1,800,866						$	15.92
$20.00 - $25.05			1,731,098						$	20.28					1.2 years						1,731,098						$	20.28
			8,306,658						$	13.45					1.2 years						8,306,658						$	13.45

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, 2020, 2019 and 2018 was as follows:

			Number of non- vested restricted shares						Weighted average grant date fair value
Balance as of January 1, 2018			18,209						$	12.15
Granted			50,644						13.45
Vested			(44,788)						12.97
Balance as of January 1, 2019			24,065						13.35
Granted			403,360						11.10
Forfeited			(36,907)						11.31
Vested			(49,751)						12.40
Balance as of January 1, 2020			340,767						11.83
Granted			1,029,373						8.30
Forfeited			(16,434)						9.77
Vested			(182,648)						10.10
Balance as of December 31, 2020			1,171,058						$	8.80

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, 2020, 2019 and 2018 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, 2018			1,855,379						887,203						$	12.60
Granted			556,403						370,931						14.01
Forfeited			(294,977)						(4,102)						13.98
Vested			(115,757)						(115,757)						14.00
Change in estimated restricted shares considered probable of vesting			n/a						46,945						13.35
Balance as of January 1, 2019			2,001,048						1,185,220						12.80
Granted			862,176						574,784						10.95
Forfeited			(823,977)						(290,552)						11.70
Vested			(148,718)						(148,718)						11.40
Change in estimated restricted shares considered probable of vesting			n/a						(6,698)						12.92
Balance as of January 1, 2020			1,890,529						1,314,036						12.43
Granted			749,322						499,542						9.46
Forfeited			(372,476)						(39,214)						12.12
Vested			(504,440)						(504,440)						12.16
Change in estimated restricted shares considered probable of vesting			n/a						132,656						11.28
Balance as of December 31, 2020			1,762,935						1,402,580						$	10.98

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