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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net income as reported	$ 16,315	$ 11,832	$ 40,661	$ 35,209
Impact of assumed conversions
Weighted average common shares outstanding (in shares)	23,324,000	19,997,000	22,914,000	20,002,000
Additional dilutive common stock equivalents (in shares)	250,000	227,000	295,000	229,000
Weighted average diluted common shares outstanding (in shares)	23,574,000	20,224,000	23,209,000	20,231,000
Basic earnings per common share (in dollars per share)	$ 0.70	$ 0.59	$ 1.77	$ 1.76
Diluted earnings per common share (in dollars per share)	$ 0.69	$ 0.59	$ 1.75	$ 1.74
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Common stock equivalents excluded from earnings per share calculations due to anti-dilutive effect (in shares)			0	0
Convertible Debt Securities
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Convertible trust preferred securities, interest rate, stated percentage	9.00%	9.00%	9.00%	9.00%

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Incremental Common Shares Attributable To Additional Dilutive Common Stock Equivalents

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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