Capital Stock and Equity Awards (Tables)

6 Months Ended

Jun. 30, 2018

Stockholders' Equity Note [Abstract]

Schedule of dividends

The Company declared the following dividends during the first six months of 2018 and 2017:

Date of Declaration	Dividend per Common Share		Payable to Shareholders of Record on	Payment Date	Total Amount
2018
February 22, 2018	$	0.30	March 12, 2018	March 30, 2018	$	9.0	million
May 1, 2018	$	0.30	June 11, 2018	June 29, 2018	$	9.1	million
	$	0.60			$	18.1	million
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

Schedule of summary of option activity

The following table summarizes the option activity for the six months ended June 30, 2018 and 2017:

	Six Months Ended June 30,
	2018				2017
	Shares		Weighted- Average Exercise Price		Shares		Weighted- Average Exercise Price
Outstanding:
Beginning of period	1,479,236		$	27.81	2,234,699		$	22.84
Granted	—		$	—	205,244		$	42.24
Exercised	(255,609	)	$	21.14	(443,114	)	$	18.72
Forfeited	(29,446	)	$	36.26	(50,062	)	$	27.97
End of period	1,194,181		$	29.04	1,946,767		$	25.69
Exercisable, end of period	876,816		$	26.59	992,395		$	20.95

Schedule of summary of RSU activity

The following table summarizes the RSU activity for the six months ended June 30, 2018 and 2017:

	Six Months Ended June 30,
	2018				2017
	Shares		Weighted- Average Grant Date Fair Value		Shares		Weighted- Average Grant Date Fair Value
Unvested, beginning of period	178,882		$	37.93	196,800		$	24.38
Granted	214,907		$	39.81	119,312		$	42.19
Vested	(63,191	)	$	40.92	(39,113	)	$	32.01
Forfeited	(4,454	)	$	41.04	(19,743	)	$	24.06
Unvested, end of period	326,144		$	38.55	257,256		$	31.50

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,
	2018		2017		2018		2017
	(in thousands)
Share based compensation expense	$	1,660	$	1,784	$	3,115	$	3,578
U.S. tax benefit on share based compensation expense	198		477		371		946