Capital Stock and Equity Awards (Tables)

6 Months Ended

Jun. 30, 2017

Stockholders' Equity Note [Abstract]

Schedule of dividends

The Company declared the following dividends during the first six months of 2017 and 2016:

Date of Declaration	Dividend per Common Share		Payable to Shareholders of Record on	Payment Date	Total Amount
2017
February 14, 2017	$	0.30	March 13, 2017	March 31, 2017	$	8.9	million
May 2, 2017	$	0.30	June 12, 2017	June 30, 2017	$	8.9	million
	$	0.60			$	17.8	million
2016
February 16, 2016	$	0.20	March 14, 2016	March 28, 2016	$	5.8	million
May 3, 2016	$	0.20	June 13, 2016	June 30, 2016	$	5.9	million
	$	0.40			$	11.7	million

Schedule of summary of option activity

The following table summarizes the option activity:

	Six Months Ended June 30,
	2017				2016
	Shares		Weighted- Average Exercise Price		Shares		Weighted- Average Exercise Price
Outstanding:
Beginning of period	2,234,699		$	22.84	2,058,085		$	18.11
Granted	205,244		$	42.24	706,203		$	32.07
Exercised	(443,114	)	$	18.72	(231,916	)	$	15.95
Forfeited	(50,062	)	$	27.97	(3,362	)	$	21.00
End of period	1,946,767		$	25.69	2,529,010		$	22.20
Exercisable, end of period	992,395		$	20.95	1,017,643		$	17.01

Schedule of summary of RSU activity

The following table summarizes the RSU activity for the six months ended June 30, 2017 and 2016: 

	Six Months Ended June 30,
	2017				2016
	Shares		Weighted- Average Grant Date Fair Value		Shares	Weighted- Average Grant Date Fair Value
Unvested, beginning of period	196,800		$	24.38	234,922	$	21.00
Granted	119,312		$	42.19	60,291	$	32.03
Vested	(39,113	)	$	32.01	—	$	—
Forfeited	(19,743	)	$	24.06	—	$	—
Unvested, end of period	257,256		$	31.50	295,213	$	23.25

Schedule of summary of amount of expense and related tax benefit

Share based compensation expense is recognized on a straight line basis over the vesting period. The amount of expense and related tax benefit is summarized below:

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
	(in thousands)
Share based compensation expense	$	1,784	$	1,498	$	3,578	$	2,687
U.S. tax benefit on share based compensation expense	477		421		946		757