Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Schedule of Other Assets [Table Text Block]

Other assets consisted of the following (in thousands):

	2017		2016
Cash surrender value of life insurance	$	46,314	$	39,059
Investments in unconsolidated affiliates	3,557		3,224
Other	5,257		4,841
Total other assets	$	55,128	$	47,124

Schedule of Weighted Average Number of Shares [Table Text Block]

The following table summarizes the calculation of weighted average common shares outstanding used in the computation of diluted earnings per share (in thousands):

	For the Years Ended December 31,
	2017	2016	2015
Weighted average basic common shares outstanding	44,153	43,479	42,747
Effect of dilutive securities:
Performance shares	69	127	98
Restricted stock	42	64	63
Weighted average diluted common and potential   common shares outstanding	44,264	43,670	42,908