Earnings (Losses) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Long-term Debt.	$ 996,172		$ 502,539
Earnings Per Share, Basic [Abstract]
Net (loss) income attributable to controlling interests and available to common shareholders	(901)	$ 15,384
Less: Undistributed earnings allocated to unvested RSAs		(12)
Net (loss) income available to common shareholders	(901)	15,372
Earnings Per Share, Diluted [Abstract]
Add: Undistributed earnings allocated to restricted shares, Diluted		12
Less: Undistributed earnings reallocated to RSAs		(12)
Net income available to common shareholders and assumed conversions	$ (901)	$ 15,372
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted Average Shares Outstanding, Basic	45,490,461	45,073,654
Stock options added to the denominator under the treasury stock method		33,691
RSUs added to the denominator under the treasury stock method		596,143
Weighted Average Shares Outstanding, Diluted	45,490,461	45,703,488
Net (loss) income per common share – basic	$ (0.02)	$ 0.34
Net (loss) income per common share – diluted	$ (0.02)	$ 0.34
Restricted Stock Awards
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Antidilutive shares excluded from computation of diluted earnings per share		17,476
Convertible Senior Notes 1.00 percent due 2020
Long-term Debt.	$ 243,737		$ 241,068
Debt Instrument, Interest Rate, Stated Percentage	1.00%

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Nonvested equity-based payment awards that contain forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) that result in incremental common shares.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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