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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended					12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average diluted shares outstanding excludes shares of common stock subject to stock options			143,270				242,174
Cash dividend (in usd per share)			$ 0.5	$ 0.5	$ 0.3	$ 0.3	$ 0.3	$ 1.4
Payment of dividends			$ 12,442				$ 0
Deferred stock units issued to executive officers	63,677	4,784
Deferred stock units issued to executive officers, aggregate fair value	$ 6,900	$ 300
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payment of dividends			$ 12,442	$ 12,359	$ 7,371	$ 7,363	$ 7,344	$ 34,437
Weighted Average
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred stock units issued to executive officers, exercise price	$ 108.47	$ 55.22