Condensed Consolidated Statement of Changes in Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Common Stock Held in Treasury	Accumulated Other Comprehensive Income
Balance at Dec. 31, 2013	$ 417,432	$ 522	$ 240,057	$ 436,570	$ (268,253)	$ 8,536
Increase (Decrease) in Stockholders' Equity
Net income	26,546			26,546
Other comprehensive income	2,182					2,182
Issuance of common stock for restricted share awards (891,539 shares), including a net excess tax benefit of $0.3 million	349		(14,211)		14,560
Issuance of common stock for the employee stock purchase plan (32,977 shares)	432		432
Shares withheld for net settlement of share-based awards (315,431 shares)	(6,426)				(6,426)
Purchase of common stock for treasury (1,514,637 shares)	(27,047)				(27,047)
Share-based compensation	7,490		7,490
Balance at Jun. 30, 2014	$ 420,958	$ 522	$ 233,768	$ 463,116	$ (287,166)	$ 10,718