Earnings per Share Earnings per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share Calculation [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 13,554	$ 7,264	$ 26,186	$ 11,851
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Preferred Dividends	(1,219)	(1,219)	(2,438)	(1,219)
Preferred Stock Redemption Premium	0	0	0	(2,190)
Net income to common shareholders	12,335	6,045	23,748	8,442
Net Income (Loss) Available to Common Stockholders, Diluted	13,235	6,045	25,494	8,442
Weighted Average Number of Shares Outstanding, Basic	24,470	24,271	24,444	23,278
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental Common Shares Attributable to Stock Options	218	262	228	278
Incremental Common Shares Attributable to Deferred Compensation	140	113	134	115
Weighted Average Number of Shares Outstanding, Diluted	29,913	24,646	29,891	23,671
Earnings Per Share, Basic	$ 0.50	$ 0.25	$ 0.97	$ 0.36
Earnings Per Share, Diluted	$ 0.44	$ 0.25	$ 0.85	$ 0.36
Anti-dilutive stock equivalent awards not included in the calculation of diluted loss per share	1,287	998	1,221	928
2017 Convertible Senior Notes [Member]
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Interest on Convertible Debt, Net of Tax	383	0	744	0
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental Common Shares Attributable to Conversion of Debt Securities	2,416	0	2,416	0
2018 Convertible Senior Notes [Member]
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Interest on Convertible Debt, Net of Tax	$ 517	$ 0	$ 1,002	$ 0
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental Common Shares Attributable to Conversion of Debt Securities	2,669	0	2,669	0