Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Stock-based Compensation [Abstract]

Schedule of Equity Compensation Plan

Information about our equity compensation plans as of December 31, 2018 are as follows:

Plan Category	Number of Shares to be Issued upon Vesting	Number of Shares Available for Future Grants
2014 Long-Term Incentive Plan	522,786	954,552
2014 Nonemployee Director Stock Incentive Plan	19,002	537,086

Schedule of Nonvested Restricted Stock Units Activity

Non-vested restricted share awards outstanding under both the Plan and the Director Plan as of December 31, 2018 and changes during the year were as follows:

	Number of Shares		Weighted Average Grant Date Fair Value per Share
Non-vested at December 31, 2017	536,750		$	105.42
Granted	241,988		100.12
Vested	(218,625	)	103.61
Forfeited	(18,555	)	108.20
Non-vested at December 31, 2018	541,558		$	103.68

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

For the years ended December 31, 2018, 2017 and 2016, stock-based compensation expense under both the Plan and the Director Plan recognized in the income statement is as follows (in thousands):

	2018		2017		2016
Cost of product sales and services	$	8,648	$	8,879	$	10,073
General and administrative	25,546		14,063		12,006
Total stock-based compensation expense	$	34,194	$	22,942	$	22,079