Unaudited Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Results

Quarterly results of operations for 2012 are summarized as follows:

	First Quarter		Second Quarter	Third Quarter	Fourth Quarter
	(In thousands except per share data)
2012:
Revenues	$	196,662	127,609	190,985	149,407
Earnings (loss)	$	19,741	23,246	24,322	25,249
Basic earnings (loss) per share:
Class A	$	5.58	6.58	6.88	7.14
Class B	$	2.79	3.29	3.44	3.57
Diluted earnings (loss) per share:
Class A	$	5.58	6.58	6.88	7.14
Class B	$	2.79	3.29	3.44	3.57

Quarterly results of operations for 2011 are summarized as follows:

	First Quarter		Second Quarter	Third Quarter	Fourth Quarter
	(In thousands except per share data)
2011:
Revenues	$	180,367	140,151	92,354	159,875
Earnings (loss)	$	18,211	13,790	19,265	4,362
Basic earnings (loss) per share:
Class A	$	5.16	3.90	5.45	1.23
Class B	$	2.58	1.95	2.73	0.62
Diluted earnings (loss) per share:
Class A	$	5.15	3.90	5.45	1.23
Class B	$	2.58	1.95	2.73	0.62