Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Stockholders' Equity Note [Abstract]

Schedule of Change in Preferred and Common Shares Issued and Common Shares Held as Treasury Shares

The following table shows the changes in preferred and common stock issued and common stock held as treasury shares for the three years ended December 31, 2015.

(shares in thousands)	Series A Preferred Stock Issued		Series C Preferred Stock Issued	Common Stock Issued	Treasury Stock Held	Common Stock Outstanding
Balance at December 31, 2012	968		—	113,182	813	112,369
Settlement of prepaid common stock purchase contracts	—		—	17,550	—	17,550
Issuance of common stock	—		—	8,553	—	8,553
Restricted share unit activity	—		—	374	—	374
Stock options exercised	—		—	62	—	62
Issuance of Series C Preferred Stock	—		5,200	—	—	—
Redemption of Series A Preferred Stock	(968	)	—	—	—	—
Balance at December 31, 2013	—		5,200	139,721	813	138,908
Restricted share unit activity	—		—	52	—	52
Stock options exercised	—		—	177	—	177
Repurchase of common stock	—		—	—	3,014	(3,014	)
Balance at December 31, 2014	—		5,200	139,950	3,827	136,123
Restricted share unit activity	—		—	304	—	304
Stock options exercised	—		—	338	—	338
Repurchase of common stock	—		—	—	7,218	(7,218	)
Balance at December 31, 2015	—		5,200	140,592	11,045	129,547