Summary of Operations and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

	Twelve Months Ended December 31,
	2018		2017			2016
Earnings (numerator)
Net income (loss) attributable to common stockholders	$	104,021	$	(1,805	)	$	15,935
Shares (denominator)
Weighted average common shares outstanding (basic)		49,841		48,824			48,597
Dilutive effect of stock options and stock awards outstanding		1,094		-			1,192
Adjusted weighted average common shares outstanding (diluted)		50,935		48,824			49,789
Earnings (loss) per share attributable to common    stockholders
Basic	$	2.09	$	(0.04	)	$	0.33
Diluted	$	2.04	$	(0.04	)	$	0.32
Stock options and stock awards excluded from EPS    calculation because their inclusion would be    anti-dilutive (In thousands)		1,103		3,508			1,427

Component of Comprehensive Income

There is no income tax expense or benefit associated with each component of comprehensive income. As of December 31, the accumulated balance for each component of comprehensive income is as follows:

	2018			2017
Unrealized foreign currency losses	$	(64,553	)	$	(42,010	)
Unrealized gain on interest rate swap, net of tax	$	3,261		$	2,524
Unrealized loss on defined benefit plan	$	(40,554	)	$	(43,994	)