Unaudited Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Results

Quarterly results of operations for 2014 are summarized as follows:

	First Quarter		Second Quarter	Third Quarter	Fourth Quarter
	(In thousands except per share data)
2014:
Revenues	$	158,003	206,841	159,620	184,315
Earnings (loss)	$	19,826	29,183	28,466	28,113
Basic earnings (loss) per share:
Class A	$	5.61	8.26	8.05	7.95
Class B	$	2.80	4.13	4.03	3.98
Diluted earnings (loss) per share:
Class A	$	5.61	8.25	8.05	7.94
Class B	$	2.80	4.13	4.03	3.98

Quarterly results of operations for 2013 are summarized as follows:

	First Quarter		Second Quarter	Third Quarter	Fourth Quarter
	(In thousands except per share data)
2013:
Revenues	$	231,032	182,859	188,192	258,184
Earnings (loss)	$	16,632	26,991	24,782	27,842
Basic earnings (loss) per share:
Class A	$	4.71	7.64	7.01	7.88
Class B	$	2.35	3.82	3.51	3.94
Diluted earnings (loss) per share:
Class A	$	4.70	7.62	7.00	7.87
Class B	$	2.35	3.82	3.51	3.94