This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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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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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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The gross value of stock issued during the period upon the conversion of convertible securities.

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Equity impact of the value of treasury stock (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

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Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balances, beginning of period	$ 77,259us-gaap_StockholdersEquity	$ 205,176us-gaap_StockholdersEquity
Net income	80,612us-gaap_NetIncomeLoss	44,673us-gaap_NetIncomeLoss
Other comprehensive loss	(62,491)	1,223
Cash dividends
Common	(37,804)us-gaap_DividendsCommonStockCash	(37,975)us-gaap_DividendsCommonStockCash
Preference	(11)	(14)
Issuance of common stock	(7,666)	(2,898)
Conversion to common stock		0
Stock-based compensation expense	5,036	3,886
Purchase of subsidiary shares from noncontrolling interest		(7,520)
Balances, end of period	54,935us-gaap_StockholdersEquity	206,551us-gaap_StockholdersEquity
Preferred stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balances, beginning of period		4	1
Cash dividends
Conversion to common stock		(3)
Balances, end of period	1	1	1
Preference stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balances, beginning of period	548	591
Cash dividends
Conversion to common stock	(5)	(28)
Balances, end of period	543	563
Common stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balances, beginning of period			323,338	323,338
Cash dividends
Balances, end of period	323,338	323,338	323,338	323,338
Additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balances, beginning of period	178,852	196,977
Cash dividends
Issuance of common stock	(30,914)	(22,655)
Conversion to common stock	(105)	(650)
Stock-based compensation expense	5,036	3,886
Purchase of subsidiary shares from noncontrolling interest		(7,520)
Balances, end of period	152,869	170,038
Retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balances, beginning of period	4,897,708	4,715,564
Net income	80,612	44,673
Cash dividends
Common	(37,804)	(37,975)
Preference	(11)	(14)
Balances, end of period	4,940,505	4,722,248
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balances, beginning of period	(846,156)	(574,556)
Other comprehensive loss	(62,491)	1,223
Cash dividends
Balances, end of period	(908,647)	(573,333)
Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balances, beginning of period	(4,477,032)	(4,456,742)
Cash dividends
Preference		0
Issuance of common stock	23,248	19,757
Conversion to common stock	110	681
Balances, end of period	$ (4,453,674)	$ (4,436,304)