CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Class A [Member]	Common Class B [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]
Opening Balance VALUE at Dec. 31, 2013	$ 298,393	$ 313	$ 72	$ 604,721	$ (306,713)
Opening Balance SHARES at Dec. 31, 2013		31,308,194	7,197,532
Compensation expense related to granting of restricted stock awards SHARES		638,102	0
Exercise of stock options SHARES		57,500	0
Purchase of vested employee restricted stock units SHARES		(141,502)	0
Net income (loss)	26,823				26,823
Compensation expense related to granting of restricted stock awards VALUE	5,232	7	0	5,225	0
Purchase of vested employee restricted stock units	(1,514)	(1)	0	(1,513)	0
Forfeitures of dividend equivalents VALUE	5	0	0	0	5
Realization of tax benefit for dividend equivalent payments VALUE	82	0	0	82	0
Ending Balance VALUE at Dec. 31, 2014	329,021	319	72	608,515	(279,885)
Ending Balance SHARES at Dec. 31, 2014		31,862,294	7,197,532
Compensation expense related to granting of stock options SHARES	0
Compensation expense related to granting of restricted stock awards SHARES		632,102	0
Common stock repurchase SHARES		8,750	0
Exercise of stock options SHARES	8,750
Purchase of vested employee restricted stock units SHARES		(113,234)	0
Net income (loss)	(93)				(93)
Compensation expense related to granting of restricted stock awards VALUE	1,111	6	0	1,105	0
Purchase of vested employee restricted stock units	(1,338)	(1)	0	(1,337)	0
Realization of tax benefit for dividend equivalent payments VALUE	31	0	0	31	0
Ending Balance VALUE at Mar. 31, 2015	$ 328,732	$ 324	$ 72	$ 608,314	$ (279,978)
Ending Balance SHARES at Mar. 31, 2015		32,389,912	7,197,532