Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

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 shares of preferred and common stock issued and common stock held as treasury shares for the three years ended December 31, 2017.

(shares in thousands)	Series C Preferred Stock Issued	Common Stock Issued	Treasury Stock Held	Common Stock Outstanding
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
Issuance of common stock for acquisition	—	821	—	821
Restricted share unit activity	—	316	—	316
Stock options exercised	—	297	—	297
Repurchase of common stock	—	—	8,715	(8,715	)
Balance at December 31, 2016	5,200	142,026	19,760	122,266
Issuance of common stock for earnout payment	—	118	—	118
Restricted share unit activity	—	336	—	336
Stock options exercised	—	198	—	198
Repurchase of common stock	—	—	4,021	(4,021	)
Balance at December 31, 2017	5,200	142,678	23,781	118,897