Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income (numerator) [Abstract]
Net income	$ 18,619,000	$ (5,575,000)	$ 174,000	$ 214,000	$ 20,191,000	$ 24,969,000	$ 10,322,000	$ 1,627,000	$ 13,432,000	$ 57,109,000	$ (14,422,000)
Diluted earnings (loss) per share, Net income (loss) available to common shareholders									$ 13,432,000	$ 57,109,000	$ (14,422,000)
Shares (denominator) [Abstract]
Basic earnings (loss) per share, Net income (loss) available to common shareholders (in shares)									37,755,588	37,701,306	37,425,197
Effect of dilutive securities, Common stock options (in shares)									318,630	628,438
Diluted earnings (loss) per share, Net income (loss) available to common shareholders (in shares)									38,074,218	38,329,744	37,425,197
Per share amount [Abstract]
Basic earnings (loss) per share, Net income (loss) available to common shareholders (in dollars per share)	$ 0.50	$ (0.15)			$ 0.55	$ 0.66	$ 0.27	$ 0.04	$ 0.35	$ 1.52	$ (0.39)
Effect of dilutive securities, Common stock options (in dollars per share)										(0.03)	(0.01)
Net income (loss) per share - diluted	$ 0.50	$ (0.15)			$ 0.52	$ 0.66	$ 0.27	$ 0.04	$ 0.35	$ 1.49	$ (0.40)
Continuing Operations [Member]
Income (numerator) [Abstract]
Net income									$ 5,360,000	$ 21,815,000	$ 13,516,000
Diluted earnings (loss) per share, Net income (loss) available to common shareholders									$ 5,360,000	$ 21,815,000	$ 13,516,000
Shares (denominator) [Abstract]
Basic earnings (loss) per share, Net income (loss) available to common shareholders (in shares)									37,755,588	37,701,306	37,425,197
Effect of dilutive securities, Common stock options (in shares)									318,630	628,438	695,887
Diluted earnings (loss) per share, Net income (loss) available to common shareholders (in shares)									38,074,218	38,329,744	38,121,084
Per share amount [Abstract]
Basic earnings (loss) per share, Net income (loss) available to common shareholders (in dollars per share)									$ 0.14	$ 0.58	$ 0.36
Effect of dilutive securities, Common stock options (in dollars per share)										(0.01)	(0.01)
Net income (loss) per share - diluted									$ 0.14	$ 0.57	$ 0.35
Discontinued Operations [Member]
Income (numerator) [Abstract]
Net income									$ 8,072,000	$ 35,294,000	$ (27,938,000)
Diluted earnings (loss) per share, Net income (loss) available to common shareholders									$ 8,072,000	$ 35,294,000	$ (27,938,000)
Shares (denominator) [Abstract]
Basic earnings (loss) per share, Net income (loss) available to common shareholders (in shares)									37,755,588	37,701,306	37,425,197
Effect of dilutive securities, Common stock options (in shares)									318,630	628,438
Diluted earnings (loss) per share, Net income (loss) available to common shareholders (in shares)									38,074,218	38,329,744	37,425,197
Per share amount [Abstract]
Basic earnings (loss) per share, Net income (loss) available to common shareholders (in dollars per share)									$ 0.21	$ 0.94	$ (0.75)
Effect of dilutive securities, Common stock options (in dollars per share)										(0.02)
Net income (loss) per share - diluted									$ 0.21	$ 0.92	$ (0.75)