Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

Non-vested restricted share awards outstanding under both the Plan and the Director Plan as of December 31, 2015 and changes during the year were as follows:



	Number of Shares		Weighted Average Grant Date Fair Value per Share
Non-vested at December 31, 2014	469,321		$	132.33
Granted	206,855		101.87
Vested	(183,455	)	113.31
Forfeited	(29,117	)	126.09
Non-vested at December 31, 2015	463,604		$	126.65

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

For the years ended December 31, 2015, 2014 and 2013, stock-based compensation expense under both the Plan and the Director Plan recognized in the income statement is as follows (in thousands):



	2015		2014		2013
Cost of product sales and services	$	10,126	$	10,331	$	10,268
General and administrative	11,153		10,139		10,258
Total stock-based compensation expense	$	21,279	$	20,470	$	20,526