Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	155,297
Stock based-awards	5,723
Repurchase of common shares	(1,273)
Dividends paid	(24,284)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(27)
Amortization of deferred pension costs, net of tax	68
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	161	$ (889)
Net income	17,682	$ 15,117
Ending balance	153,347
Common Shares [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,148
Stock based-awards	0
Repurchase of common shares	0
Dividends paid	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0
Amortization of deferred pension costs, net of tax	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0
Net income	0
Ending balance	1,148
Additional Paid-In Capital [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	84
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	52,850
Stock based-awards	1,506
Repurchase of common shares	0
Dividends paid	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0
Amortization of deferred pension costs, net of tax	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0
Net income	0
Ending balance	54,440
Retained Earnings [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(84)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	187,957
Stock based-awards	0
Repurchase of common shares	0
Dividends paid	(24,284)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0
Amortization of deferred pension costs, net of tax	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0
Net income	17,658
Ending balance	181,247
Accumulated Other Comprehensive Income (Loss) [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(9,828)
Stock based-awards	0
Repurchase of common shares	0
Dividends paid	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0
Amortization of deferred pension costs, net of tax	68
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	161
Net income	0
Ending balance	(9,599)
Treasury Stock [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(80,773)
Stock based-awards	4,217
Repurchase of common shares	(1,273)
Dividends paid	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0
Amortization of deferred pension costs, net of tax	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0
Net income	0
Ending balance	(77,829)
Non-Controlling Interests [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	3,943
Stock based-awards	0
Repurchase of common shares	0
Dividends paid	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(27)
Amortization of deferred pension costs, net of tax	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0
Net income	24
Ending balance	$ 3,940