Condensed Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified		Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Deferred Compensation [Member]	Treasury Stock [Member]
Beginning Balances at Dec. 31, 2012		$ 256,598	$ 4,671	$ 150,750	$ 106,239	$ (5,062)	$ 982	$ (982)
Beginning Balances, shares at Dec. 31, 2012	[1]		9,597,499
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		32,787			32,787
Other comprehensive loss/income		2,529				2,529
Stock Issued During Period, Shares, Dividend Reinvestment Plan			0
Stock Issued During Period, Value, Dividend Reinvestment Plan			0	(6)
Dividends		(14,758)			(14,752)
Conversion of debentures, shares	[1]		17,383
Conversion of debentures		295	8	287
Share-based compensation, shares	[1],[2],[3]		23,348
Share-based compensation	[2],[3]	1,322	12	1,310
Treasury stock activities, shares			0
Treasury stock activities		0	0	0			142	(142)
Ending Balances at Dec. 31, 2013		278,773	4,691	152,341	124,274	(2,533)	1,124	(1,124)
Ending Balances, shares at Dec. 31, 2013	[1]		9,638,230
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		22,815			22,815
Other comprehensive loss/income		60				60
Stock Issued During Period, Shares, Dividend Reinvestment Plan			5,193
Stock Issued During Period, Value, Dividend Reinvestment Plan			3	318
Dividends		(7,418)			(7,739)
Retirement Savings Plan Shares			9,834
Retirement Savings Plan Par Value		602	5
Retirement Savings Plan APIC Value				597
Conversion of debentures, shares	[1]		31,542
Conversion of debentures		535	15	520
Share-based compensation, shares	[1],[2],[3]		26,772
Share-based compensation	[2],[3]	856	13	843
Treasury stock activities, shares			0
Treasury stock activities		0					78	(78)
Ending Balances at Jun. 30, 2014		$ 296,223	$ 4,727	$ 154,619	$ 139,350	$ (2,473)	$ 1,202	$ (1,202)
Ending Balances, shares at Jun. 30, 2014	[1]		9,711,571

[1] Includes 34,960 and 34,495 shares at June 30, 2014 and December 31, 2013, respectively, held in a Rabbi Trust related to our Non-Qualified Deferred Compensation Plan.

[2] Includes amounts for shares issued for Directors’ compensation.

[3] The shares issued under the SICP are net of shares withheld for employee taxes. For the quarter ended June 30, 2014 and for the year ended December 31, 2013, we withheld 8,458 and 10,411 shares, respectively, for taxes.