Capital Stock and Equity Awards (Tables)

3 Months Ended

Mar. 31, 2018

Stockholders' Equity Note [Abstract]

Schedule of dividends

The Company declared the following dividends during the first three 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
2017
February 14, 2017	$	0.30	March 13, 2017	March 31, 2017	$	8.9	million

Schedule of summary of option activity

The following table summarizes the option activity for the three months ended March 31, 2018 and 2017:

	Three Months Ended March 31,
	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	—		$	—	195,509		$	42.17
Exercised	(142,129	)	$	20.14	(97,211	)	$	17.23
Forfeited	—		$	—	(50,062	)	$	27.97
End of period	1,337,107		$	28.63	2,282,935		$	24.62
Exercisable, end of period	983,508		$	26.06	1,334,756		$	20.47

Schedule of summary of RSU activity

The following table summarizes the RSU activity for the three months ended March 31, 2018 and 2017:

	Three Months Ended March 31,
	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	117,879		$	42.17
Vested	(62,714	)	$	40.90	(37,485	)	$	32.07
Forfeited	—		$	—	(19,743	)	$	24.06
Unvested, end of period	331,075		$	38.59	257,451		$	31.43

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 March 31,
	2018		2017
	(in thousands)
Share based compensation expense	$	1,455	$	1,794
U.S. tax benefit on share based compensation expense	173		469