Equity and Noncontrolling Interest (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Beginning Balance	$ 365,135,000	$ 344,696,000
Net Income	10,607,000	13,309,000
Amounts reported in other comprehensive income (loss)	(8,535,000)	1,889,000
Dividends, Common Stock	(4,000,000)	(3,308,000)
Share Issuance and Equity-Based Compensation Plans	1,635,000	1,183,000
Excess Tax Benefit From Stock Option Exercises	287,000	239,000
Ending Balance	365,129,000	358,008,000
Common Stock Member
Beginning Balance	13,301,000	13,196,000
Net Income	0	0
Amounts reported in other comprehensive income (loss)	0	0
Dividends, Common Stock	0	0
Share Issuance and Equity-Based Compensation Plans	31,000	31,000
Excess Tax Benefit From Stock Option Exercises	0	0
Ending Balance	13,332,000	13,227,000
Additional Paid-in Capital [Member]
Beginning Balance	99,056,000	99,038,000
Net Income	0	0
Amounts reported in other comprehensive income (loss)	0	0
Dividends, Common Stock	0	0
Share Issuance and Equity-Based Compensation Plans	1,604,000	1,152,000
Excess Tax Benefit From Stock Option Exercises	287,000	239,000
Ending Balance	100,947,000	100,429,000
Retained Earnings [Member]
Beginning Balance	299,524,000	258,285,000
Net Income	10,378,000	12,730,000
Amounts reported in other comprehensive income (loss)	0	0
Dividends, Common Stock	(4,000,000)	(3,308,000)
Share Issuance and Equity-Based Compensation Plans	0	0
Excess Tax Benefit From Stock Option Exercises	0	0
Ending Balance	305,902,000	267,707,000
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance	(54,406,000)	(34,700,000)
Net Income	0	0
Amounts reported in other comprehensive income (loss)	(8,565,000)	1,685,000
Dividends, Common Stock	0	0
Share Issuance and Equity-Based Compensation Plans	0	0
Excess Tax Benefit From Stock Option Exercises	0	0
Ending Balance	(62,971,000)	(33,015,000)
Noncontrolling Interest [Member]
Beginning Balance	7,660,000	8,877,000
Net Income	229,000	579,000
Amounts reported in other comprehensive income (loss)	30,000	204,000
Dividends, Common Stock	0	0
Share Issuance and Equity-Based Compensation Plans	0	0
Excess Tax Benefit From Stock Option Exercises	0	0
Ending Balance	$ 7,919,000	$ 9,660,000