Earnings per Share Earnings per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share Calculation [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 12,632	$ 4,587
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Preferred Dividends	(1,219)	0
Excess of fair value over book value of preferred shares redeemed	0	(2,190)
Net income to common shareholders	11,413	2,397
Net Income (Loss) Available to Common Stockholders, Diluted	12,253	2,397
Weighted Average Number of Shares Outstanding, Basic	24,417	22,273
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental Common Shares Attributable to Stock Options	239	296
Incremental Common Shares Attributable to Deferred Compensation	129	119
Weighted Average Number of Shares Outstanding, Diluted	29,870	22,688
Earnings Per Share, Basic	$ 0.47	$ 0.11
Earnings Per Share, Diluted	$ 0.41	$ 0.11
Anti-dilutive stock equivalent awards not included in the calculation of diluted loss per share	1,154	856
2017 Convertible Senior Notes [Member]
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Interest on Convertible Debt, Net of Tax	358	0
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental Common Shares Attributable to Conversion of Debt Securities	2,416	0
2018 Convertible Senior Notes [Member]
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Interest on Convertible Debt, Net of Tax	$ 482	$ 0
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental Common Shares Attributable to Conversion of Debt Securities	2,669	0