Financial Results by Quarter Financial Resutls by Quarter (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Data [Abstract]

Schedule of Quarterly Financial Information

	THREE MONTHS ENDED
(Dollars in thousands, except per-share amounts)	MARCH 31				JUNE 30				SEPTEMBER 30				DECEMBER 31
	2013		2012		2013		2012		2013		2012		2013		2012
Revenues	$	139,253	$	112,384	$	133,212	$	117,540	$	157,869	$	151,911	$	139,955	$	143,299
Operating income	26,608		12,519		29,441		17,090		30,904		28,763		20,645		26,570
Net income	15,487		5,051		19,182		5,080		22,191		18,599		13,721		13,864
Net income per share1
Basic	$	0.38	$	0.13	$	0.47	$	0.13	$	0.55	$	0.46	$	0.34	$	0.34
Diluted	0.38		0.13		0.47		0.13		0.54		0.46		0.34		0.34

¹   Per-share amounts are computed independently for each of the quarters presented. Therefore, the sum of the quarterly per-share amounts may not equal the total computed for the year.