Condensed Consolidated Statement of Changes in Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock
Beginning Balance at Dec. 31, 2013	$ 568,924	$ 670	$ 548,935	$ 30,084	$ (10,765)
Beginning Balance, shares at Dec. 31, 2013	65,652,690	66,959,000			1,306,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	181,875	75	181,800
Issuance of common stock, shares		7,500,000
Cost to issue equity	(590)		(590)
Stock Issued During Period, Shares, Issued for Services		17,000
Stock Issued During Period, Value, Issued for Services	13	0	13
Stock options expense related to equity based awards	1,666		1,666
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		(2,000)
Stock Issued During Period, Value, Stock Options Exercised	6	0	6
Liability based stock option awards exercised, forfeited or expired	84		84
Restricted stock issued		2	(2)
Stock Issued During Period, Value, Restricted Stock Award, Forfeitures	(18)		(18)
Restricted stock issued, shares		205,000
Restricted stock forfeited, shares					29,000
Restricted stock and restricted stock units expense	2,171		2,171
Net income	64,208			64,208
Ending Balance at Sep. 30, 2014	$ 818,339	$ 747	$ 734,065	$ 94,292	$ (10,765)
Ending Balance, shares at Sep. 30, 2014	73,348,734	74,683,000			1,335,000