Shareholders' Equity and Dividends (Tables)

12 Months Ended

Dec. 31, 2017

Shareholders' Equity and Dividends [Abstract]

Summary of Common Stock Repurchase Program

The following table provides information regarding our common stock repurchase program as of and for the years ended December 31, 2017, 2016, and 2015 (in thousands, except for per share data):

	2017		2016		2015		Three-Year Total
Shares repurchased	961		13,144		3,706		17,811
Aggregate purchase price	$	44,495	$	359,885	$	125,000	$	529,380
Average price per share	$	46.32	$	27.38	$	33.73	$	29.72

Schedule of Quarterly Dividends Declared and Paid

The following table summarizes cash dividends declared and paid in each of the quarterly periods in the years ended December 31, 2017, 2016, and 2015 (in thousands of dollars, except per share amounts):

	2017				2016				2015
	Per Share		Amount		Per Share		Amount		Per Share		Amount
Quarter Ended
March 31	$	—	$	—	$	—	$	—	$	0.10	$	6,944
June 30	—		—		—		—		0.10		6,933
September 30	—		—		—		—		0.10		6,667
December 31	—		—		—		—		0.10		6,563
Total	$	—	$	—	$	—	$	—	$	0.40	$	27,107